Not brlliant but see Re: How to store CODE ref for a method of accessing the source for a coderef without resorting to B:: trickery (of course it's not perfect since it doesn't preserve closureness, but then that's a hard problem no matter what . . .).

Update: Never mind, that's not blessing the coderef directly it's overloading &{}. I thought I'd done something similar with blessed coderefs. Hrmm . . .