I'm with Zayk on this one, which is why I'm thinking of one of the larger/better supported South American languages. I think our four options really are Quechua, Aymara, GuaranĂ, and Mapudungun, and of those it was mentioned how difficult it was to find resources for GuaranĂ.
Personally, my votei s for Mapudungun, but I'm fine with whatever y'all pick.