Hi,
that tree grows naturally where I live and I would say it's the densest and hardest wood around here. It has been used for the most hard works for many time, it's sg is > 0,9 and sometimes it sinks on water so I bet it can make a good bow. I have been looking for staves but all trees I find are gnarly and twisty. If you can find a tree quite straight try it and be prepared isvery hard to work,
greetings
Sergi