A week or so ago I sent a customer request to Canon (https://www.usa.canon.com/internet/...duct-showcases/projectors/contact-a-sales-rep) to make a suggestion on RF lenses and camera features (like aperture bracketing) that I'd like to see them add in the future. To me surprise, I got a very nice response from Tim at Camera Support <email@example.com> thanking me, with a few nice personally written paragraphs, and saying that my suggestion would be passed on. I responded with a few more suggestions, getting a nice response from Jacob. I have no idea if it will make any difference, but I will say that they were amazingly responsive and friendly and I think others interested in Canon might find that good to hear.Not sure who I could contact though, or if they'd listen to an amateur.
If they see your work, and history with the MP-E 65, the people that matter in Japan might take you very seriously and you might just make a difference. If they decide to design a new version of a RF MP-E 65 with AZ (user controlled auto-zoom, which also does the auto-focus when zooming) then the whole macro community can celebrate!