While I'm not familiar with the PB's stuff, IIRC the SSR3 is a fairly aggressive polish that will probably require a follow-up with something milder.
I wouldn't let the presumed thickness of the VW clear influence my choice of polish. I use the same stuff on my thick, hard Audi clear that I use on my thin, softer Mazda clear and even on the old ss cars.
FWIW, I'd track down the discontinued but still available 3M PI-III RC (05933) and MG (05937).