If it's a kid bow option I might be in for a Hackberry bow, but I would need more info than what we got with the adult bow swap.
I've got 2 nephews that I made osage longbows for and made some mistakes the first time around because I couldn't gather much info. They were Christmas presents so I was relying on my older brother to give me some specs, lets just say he's not much of a trad guy and the specs he gave me were ball park at best.
They did turn out real well and they really enjoy shooting them, but in hindsight I would have made them a bit stronger so they could use them another year or two before out growing them.