I have used white bone knife scales as an ivory substitute. I inlay it and then pin it with small brass rod. You can get the knife scales from eBay and knife suppliers. They come in various sizes, but I used 1x3x1/8. I cut to shape with a jeweler's saw, dig out the inlay area, mix my epoxy, clamp the piece of bone in place. Next day drill holes for 3/32 brad rod, epoxy them in place, next day clip off the excess and file and then sand everything even.