I actually think this is a great idea for the vanilla game! As another fellow strictly vanilla player it's always great for a game to give more alternative types of weapons/ammo. Atlatls specifically I rarely get to see in other games which would make the game even more unique than it already is. My friends and I have all had a good talk about this and we all agree that people just starting out with the game would be surprised with this being an option.
I look forward to seeing more suggestions A yes from me