I used to use G-10 for building boomerangs and I've cut quite a bit of it. First of all, wear a good respirator. That dust is extremely bad for you!

A band saw does work well but yes, it will destroy your blade. Actually, it'll grind the teeth completely off the blade. I've heard of using carbide tipped blades but they're expensive. I had some old blades and I'd use them until the teeth were gone.

Dave