Chinaberry is a nice wood, it carves nicely and has nice color as well. If it really is poisonous, well, I must be invincible
I cut a lot of this wood, use it a lot in other wood working projects, never try as bow yet....
Ive had the sap run in my eye before, sawdust all over me, breathed in sawdust, worked wood while green, even eat with a chinaberry spoon!
Something not right with that information.....I think you should be ok to use the wood.
It may be slight brittle wood since it is related to the mahogany wood, so, make wider and longer than you normally do.