For the conversion:
MI632 work perfectly all the last season,so no particular issue
I also have MI422P and the
motor are the same as MI632 ,so
brushless one and they work with a ZS-X11H BL driver.
The issue is in the braking mode on big slope.
Motor don't use a high gear ratio, You can see that, if mower is not powered at all (without battery ,it can move at the down of the hill alone.)
If you don't have slope on your area:
Conversion on wired config is easy using Teensy PCB and TeensyBer
For Sunray
RTK ,normaly no particular issue also, but need more knowledge, so i recommend to test first using perimeter wire and move later to GPS
RTK.
Bumper sensor use 4 * KY-003 module and work exactly like the original one.