Hi Zandit, a cheats way is to cut up some high density foam to place under the PUP so that it acts with a bit of a spring action and maybe then you don't need the traditional springs. That is what came with the Custom John Bensons that went in the EX-5 and no springs were used at all.
This what '80s Kramers did. You have to replace the foam after 10-15 years as it starts to powderise. But it would probably be your best bet.