If you do try the PAFs in your VSBL, please post some before and after sound clips. I've been thinking of doing the same thing myself. I find the Evos just a little too over-the-top sometimes, and every now and then I pick up my junky RG470 just contrast that with the sorta browner, softer sound of the V7/V8. I'm not much of a tone guru yet, so I'm not really sure if that browner tone is due to more to the basswood body than the pickups. Also, my VSBL is still a fairly fresh chunk of wood, it may develop more brown-ness over the next year.
In any case, from what I've read, the Breeds sound like an interesting idea too.