will this work if i activate it after starting a new map?

The whole idea of this series is that you load the appropriate mod for the map you're playing.
Isn't it self explaining that a large map with slow time enabled must not load a mod with needs for small maps without slow time? At least I would think so...

There is no way to put all these different mods into one, since they need to change the same needs definitions according to what's loaded. If I could have made just one mod which does it all and finds out which needs to use, then that would have been released, instead of separate mods.

Why don't you put a note in the description saying "You need to unload and reload one at a time" rather than "Start a map with this mod and it will 100% work with absolutley no catch" because that seems like a pretty crucial step to miss. I just asked because it was completely ambiguous and the fact that there were three versions seemed suspicious.

Don't enable them all at once. Otherwise only the mod on top of the modslist would be active and overrule the others.

(Question; does this basically just automatically detect the correct mutator is enabled on the map before enabling or will they break if I keep all three versions enabled? Your instructions are very specific but they don't exactly say "Don't do this for this reason" so I figured it was worth a mention. If not just enabling and disabling them when switching between different map sizes is not that bad.)