I was more concerned about the aperture control than the focus. Aperture control is electronic on M4/3 lenses. The rings you mentioned would force me to use my m43 lenses wide open.The short answer is no. They would have to be proprietry products and hence expensive. A lot of macro enthusiasts prefer manual focus anyway.
Yes, good theory, however low demand, high price, just look at the prices for the Olympus extension tube and teleconvertor produced for the 4/3 system, sorry but that's the reality of the situation.Note that to pass through the electronic signals *ought* reasonably cheap to do. Each tube would need a plastic block with contacts on each side, wired together. The contacts would simply be electrical passthrough connections - no computer chips required. Yes, they won't be dirt cheap, but the design requirements would be relatively simple. The camera side would need 11 gold plated contacts. The lens side would need 11 gold plated pin contacts. In volume, that ought not be expensive and it doesn't require any complex reverse engineering.