Can anybody recommend some quality 'platform' pedals that I can use Powergrip Pedal Straps with?
All I come up with are DMR V8 style pedals, or cheap Well-Go. The only other one I have come up with are MKS MT Lux Comp, anybody have any experience of these?

From memory, you'll need to involve a file and a saw to fit them to V8s. I think they're designed to work with the sort of things that regular toe-straps work with – so the MKS jobbies are the right sort of thing.

Mind, they worked OK on V8s for me after I'd done the modifications.

I used Powergrips on Bontrager King Earl pedals. I needed to add a few washers but it worked a treat.