Mods like Overloard and Guard Villagers are able to use crossbows and bows,
can be a great integration to disguise the guns as crossbows or bows to make guns usable by those mods' mobs.

---> Overlord Crossbow code

---> Guard Villagers Crossbow code

Overlord appears to be stuck at 1.19.2

and it seems Guard Villagers supports guns already