For anything giving you some benefit like a national spirit, increased resources, building slots, improving designers and pre existing researched items (if possible), strengthening leaders, aces and etc it should be broken up in a way where you have multiple choices with each row/choice being mutually exclusive.

Essentially you would have Focuses & Decisions which goes with short term, mid term, long term, and Phoenix Term (last mentioned take the longest but give the best perks and etc) so you basically can tailor and control to a degree how long you wait for getting something good, there should be both pros and cons with all except perhaps the mid term which is sort of a compromise between short and long term, this would increase and improve replayability.

Afromentioned can be applied to improve puppets, autonomus colonial administrative bodies, certain allies you are guaranteed to get depending on ideology and path you take for it.

For both Royal And Imperial choices, would be kinda cool to have a Benevolent Branch which is all about having the greatest grand kingdom/empire, not necessarily in size, but in overall power and capability, and the peopl living in it are happy, free and have liberties that would make USA jealous, this branch would also be having special benefits that do take time to take effect even after finishing the focus or decision for them, but once they activate they can be a great boon.

New Models for Soldiers, Planes, Naval Vessels, Ground Vehicles and other objects you would normally be able to see on the map, maybe even dependant on ideology and ideological path, and a decisions selection for it if you feel like mish mashing it.

More of the above where you can select what kind of flag, nation colour and name of the swedish nation to best suit personal tastes, in Decisions, and maybe also faction name changes.

Name Changing for world locations (regions, provinces and cities etc) with a decision to do so when taking over locations and in peace time unless appropiate in wartime like retaking old Ingria and Pburg and rename it to it's old swedish name.

Better sounding Ace Names, Large list of Ship names, and Divisions.

Mod original and new army/army group, fleet/armada symbols, and division/ship symbols.

(Potential Allies section, some may depend on matching ideology or other factors)

Allies Sweden can get, via focus and/or by setting it up in options

Japan (and it's puppets)
Turkey/Ottoman Sultanate/Empire
Romania
Poland
*Finland(*if you decide that they deserve their independence or they decline reunification)
Persia
Kingdom of Siam
Yunnan
South Africa or Liberia
Venezuela
Guatemala
Chile
Holland
Belgium
Any of the Baltic States, all of them or them combined to form a united baltic state/ Swedish United Baltic Duchy, unless you decide to just annex all of the baltic.
Czechoslovakia
Yugoslavia or Bosnia and Kosovo
Australia and/or New Zealand, may depend on some factors like pregame setup and etc.
White Ruthenia [alternate non ♥♥♥♥♥♥ Belarus] (when liberated/puppeted from the USSR
Ukraine, same as Ruthenia
Countries that can be liberated and/or puppeted if you choose so instead of land annexing as a whole.

Female Leaders, Ministers, Aces and etc, something just nice incase just want to go full egalitarian and have equality for all regardless of sex, faith or whatever.

Music Standalone Sub mods, author or community or both entities can help make it.

Anime Sub mod is NOT something the original creator needs to make, the community for the mod can do that if they really want to, just make sure it fits with the original even though it's made into anime.

(was seriously thinking of just slapping some good sounding japanese instrumental but, this is just too good, it carries everything i wanted in what i envision with the mod, seriously mod author listen to it and you'll understand)
Main Menu Theme Nationalsången Cover [Epic Orchestral]
Originaltitel: Svea Rike - The Swedish National Anthem in G-Major (feat. Mauricio De Carvalho)

Regarding ingame handling of religion, either stick to current religion convert to another or establish a royal/imperial council/ministry of faith and not have a recognized official state main religion, iow embrace diversity and all beliefs.

Swedish Superiour counterpart to the US Pentagon.

If possible animated flag gif/s.

Sub mod to possibly start game after treat of versailles signing 1918-1919 or end of Russo Japanese War 1905

(i might make another thread to post possible backgrounds for alternate sweden and (maybe alternate japan, like i said, japan and sweden has had long and very good relations irl so yeah, they're practically Sweden of East Asia, and seeing japan as an assured ally is not really unthinkable with that in hindsight.)

If you want i can also give you scripts for mod alternate history background and pick whichever sounds best to you and fits the most, it's all up to you here again.

New Flavor names & texts to research items, one thing i really want to fix is the subtle negativity in the non carrier capital ship description towards it.

All new fictious original tanks, ground vehicles, airplanes and naval ships in both research and
3d models, that are not super futuristic sci fi but believable yet greater/superiour to what perhaps anyone during interwar and ww2 had/used for sweden and japan, may be extended if the are other nations that will mostly go pro sweden or join swedish faction, i know i already covered this but still.

Decisions to alter between english names, romanized japanese(if anyone play as japan and go pro sweden) and swedish names on world map for nations, places etc.

This Post will most likely update as i come up with more stuff to suggest/add.