Understand how you enjoy sharpening your own SR, but with DE blades so cheap (besides modern ones inability to hone) why would you continue your quest for sharpening your own DE blades.

The DE has its own allure and routine that more than makes up for the difference in SR's. You get to try a myriad of blades, each performing differently on different beards. That and the difference in shave experience from razor to razor (ie a Gillette Tech from a Superspeed).

Only way you'll achieve your wishes are the Rolls Razor (I have one) and trust me, if your goal is to introduce your skeptical friends to wet shaving the Rolls is an equally HORRIFYING route to go. You'll be asking them to shave with a knife on a stick. That or try and find some vintage all steel blades and one of those 'reel' looking spin sharpeners - and hope you find one with good leather in it. But I would think that's even MORE involved than SR and would probably turn off your friends. Better to wean cartridge users to SR's and the ability to change to what I consider a new superior safety blade each week than to scare them with 80 year old all steel 'vintage' blades and questionable sharpening novelties. If your friends attempts at using these contraptions don't produce absolutely razor sharp blades EVERYTIME, it will only take ONE bad shave (and the cuts that go along with duller blades) to make your friends hate you ;->