Nice looking piece of bocote. I've got some bocote scrap that came off the riser of the longbow I'm making. My plan is to use it to stick a handle on a Helle blade, just like you did. Always wanted a matching knife and bow.

The Massey finish and Fullerplast are both good. Several coats of plain old spray-on polyurethane will work fine (Minwax Helmsman Spar Urethane is what I like).