In reply to spearing05: Like all tools of that age the Black Prophets were not designed with leashless in mind (I've got similar shaped CM Pulsars). I think with out the progressive bend through the whole shaft that all modern tools have the hand position and action might not be great climbing leashless with those sort of tools even if you can engineer some sort hand rest at the base.
If you don't want to get new tools, how about engineering some good clip wrist loops (which give you many of the advantages of leashless + plus the advantages of leashes)?