Might be worth starting in c/RPG with basic questions, and if they end up drumming up a lot of conversation maybe a community is warranted? I know traveller has been around a long time, but I don't ever hear too much about it so I'd guess the community for it is pretty niche
for what its worth, the new (2024/2025) monster manual supposedly has spellcasting monsters with more "magical" actions built in. While they do still have a list of spells, they have more built in tailored "magic action" type things they would be using instead of spell casting in most scenarios, like having a "magic bolt" type attack for a mage or something. We don't exactly know how extensive this is yet, since we've only seen previews so far, but it could make running spellcasting creatures a bit easier.