I use a lot of micarta but have never used G-10. I use either Devcon, Duro or occasionally, Conap. The latter was recommended by Loveless and Barney in their book so I gave it a try. I believe Sheffield carries Conap. The main thing is to use an epoxy that cures in 90 minutes to 2 hours. The slow cure epoxies are much stronger and give you plenty of time to work with your handle slabs. In my opinion, all three epoxies mentioned above work equally well.
Fox