If there is a stave or two that have bug holes you can't get rid of. Just incorporate the holes so they are not on the edge sand the edges smooth and coat them with super glue. If the holes are deep, then fill them with some sort of powder (wood, horn, antler, it doesn't matter) and super glue then sand it smooth. The powder gives a filler surface for thee super glue to bond to and essentially give lots of tight glue lines instead of one big loose one. Ive done this with a few bows and they've held fine so far. Worst case, the bug holes raise a splinter and break te bow, and you were just going to burn it anyway. Or you could walk away with a bow with some beauty marks.
Kyle