Here's a low tech, cheap set up for sanding and light shaping work. A shaving horse is nice, wish I had one, but I don't think it would be ideal for glass bows. This set up works for just about any bow unless the handle is already shaped and of a complex design.
Works for all limb angles and handle shaping.
It does need the brace. If you don't mind drilling a hole in your bench top, the post brace is solid. Another option would be a post mounted to a small base which could be clamped to the bench