Out of curiosity, is this for personal use or because you're supplying a demand? Because you may one day have me as a customer if it's the latter. The Performance MX was a step backwards in ways I cared about, and the Master has issues for me as well. I have yet to find the right replacement to the Revolution.
Initially for personal use, as I've been finding that all the ones available on eBay and the like are either faulty or close to faulty (buttons starting to double-input after a few months, rubber coating wearing off, wheel getting stuck in one scroll mode, etc) so I generally need to meld multiple mice together to get a functional one that doesn't due too quickly.
But if I can accrue enough, I've considered selling refurbs or offering a refurb service. The L/R switches are easy enough to source and replace (Omron still sell compatible switches) & the others are jellybean tac switches, and batteries are still available via ebay/alibaba. The tricky parts would be the motor for the scroll switch mechanism (probably not too bad once specced, but replacements would probably ned to be shimmed to fit well, and I don;t look forward to trying to remove then reglue that tiny tiny cam), the scroll mechanism itself (parts are mostly too small and too high tolerance to 3D print replacements), and the rubberised coatings on the shell. Plus some longer FFCs to make shucking the two helves less of a pain.
New Are you planning some kind of... revolution with these?
The last option is to harvest intact scroll mechanisms and transplant into an entirely new mouse. Non-logitech thumbwheels are available as industrial control components, there are a few breakout boards for the PMW3360, and Omron have more SPST switches than you'd ever need. Hard part would be getting the minimum orders for a mould for the body shell, and dodging Logitech's lawyers. But who knows, maybe 'custom mice' will be the next big craze after mechanical keyboards?