Koa is not atypical wood...it is usualy harvested old school and air dried...I have made a lot of projects with them involved...
if you have a moisture tester anything under 8-10% is Ok...but be careful grinding it...it is very sensitive to heat...and can burn very easily.And the burn marks go very deep in a hurry.
west system, smooth on or even gorilla glue does well with it ( GG for a handle)