I really like the mod/datapack but it honestly feels way too much... Is there a way to keep the new strongholds but not some of the other things? The withering enemies in the end, hp increase, new end cities (which would be fun side-challenges but they replace end cities :( ) etc

TL;DR:

Is there any way, or any plans, to make an alternative version that adds just the structures? Preferably while blending vanilla and stellarity end city structures without overriding vanilla ones (It would be handy if you're on a server and didn't get an elytra from a regular ship in time, so now you have to go and do challenges to get one!)

https://modrinth.com/datapack/stellarity-lite

Close, but I'd prefer it if vanilla end cities weren't also erased

you can contact this guy on discord for that @szarkans

are you referring to lite?
https://modrinth.com/datapack/stellarity-lite