I have seen a Service Vision Scorpio Remote Focus system - same folks make the Scorpio stabilised head - works okay except if there's lots of WiFi around. No idea on price.
My standing on lens remotes is to buy whatever there's a lot of in your area, in case you need spares. I have seen Bartechs fail for no reason, I have seen Prestons fail for no reason, everything has a few bad experiences. That said, the Preston gear seems a lot hardier than most anything but Arri and Cmotion.