If Gillette or Schick sold something like the Wilkinson Sword Classic in America that might be a good start.
I have to disagree, a DE for me is much faster than a cart and not much harder to use in terms of technique. DE's dont clog, and theres 2 sides! I have a problem with the stigma around DE's being difficult to use. Have you tried a Tech?
Reliable market share numbers don't exist for retro shavers,but not only have GQ, Esquire, and Details featured the products, more than 45,000 members of the online forum Badger & Blade post daily about shaving with century-old razors.