I havn't tried antler ,but I have made a few like that with horn and sinew.
That's the way I do it.Butt joint at the handle ,tooth the entire back of both horns .Then make a short 3" piece to overlap the butt joint at the handle,and tooth both sides of the short piece.Drill a small hole in both limbs and matching holes in the short handle piece. Next I peg it all together with hand made horn dowels and hide glue . I leave the pegs just a little bit proud ,and sinew wrap the handle with one layer to come up flush with the pegs.
After the assembled limbs have dried for a few weeks I put on the first sinew layer ,after 4 layers of sinew these little bows will pull into a 'C' so wrapping the limbs with sinew is usually necessary. Some of them end up completely wrapped.
Ralph