Here's a reminder look at the Vogue seat base.
So the TR6 diaphragm looks like the best contender.
I figure if I cut four pieces of 40mm by 3mm flat aluminium and drill holes for the TR6 links, then drill holes that line up with the 12 Vogue links down the other side (and use the old Vogue links), I would get a nice fit. The 40mm flat would stop the seat foam falling down where the rubber diaphragm doesn't fill the gaps between it and the seat frame.
For the back of the seat (I was going to use the old rubber but have read too many recommendations to always replace the rubber) I was thinking of using webbing straps.
I figure six pieces of 50mm wide seat upholstery elastic webbing. They call this Premium grade. I have sent an email asking how long it would last in the environment of a car. If I don't use this then maybe seatbelt webbing but then I would have to use tension springs instead of the wire link thingys.
Clamp the webbing ends (with the clamps pictured below) then drill a single hole through the clamp for the link.