OK, I've got one more idea that may or may not be worthwhile to you. I saw a selfbow several years ago that was cut on the diagonal across the handle and then wrapped with fiberglass. No pins, no bolts, no trying to fit the handle into a sleeve. Just rasp your handle down a bit, cut it on the bandsaw, wax one part well, temporarily screw handle back togtether, wrap with fiberglass, back out the screws and wrap teh rest of the handle. Then reshape as necessary.
After making two selfbows with the metal sleeve, I have to say this has got to be the easiest solution that I have even seen. However, I have not used it . . . yet! If ya need more info, I may have a picture from the guy who did it archived. Just call me, 423-9zero3-252zero
Hugh