I would also like to know and would absolutely LOVE to have new or heavily altered campaign material especially now that it looks like the game's developers have stopped working on the project...

Whenever I think of playing again, I remember the slog that is the first 5-6 missions. I need any alternative to that.

There have been 4 different campaign mods released. You find them when searching for most recent mods.

The problem maybe is, that horizon of many players only does reach to Tons of Guns and some other most known mods. When users more or less ignore a lot of other mods, it is questionable how many of these are being created. But you never know.

What kind of allocation of resources would create a scenario as that what we have, that new campaign mods get stuck with 100 subs after weeks of release, while ToG still makes +100 subs a day basically.

New players who search for mods already come with the bias and aren't looking for much more. Other mods are not even looked at in many cases.