Purse retention would go some way to at least making sure they have some financial fall back if they need it.

boozeboxer is spot on thought that the alphabet boys would show little if any interest in this kind of scheme. The BBBC (in Britain) may be able to work something out but I honestly believe something like the Proffesional Boxers Association would have the fighters best interests at heart and would like to see them involved in it's set up.