This is actually much easier than that.
Assuming you have skate A and skate B and they each have VESC-compatible ESCs Left and Right
(this actually won’t work on single drives 
) (assuming dual drive for everything)
- Connect a Mini Remote radio receiver to skate A ESC left
- Connect a Mini Remote radio receiver to skate B ESC left. (You could actually do this with more skates, but only with 2 remotes.)
- Connect a GT2B radio receiver to skate A ESC right
- Connect a GT2B radio receiver to skate B ESC right.
- Pick two integers, I’ll use these two. They can’t be the same. left: 37 right: 42
- Connect a bluetooth or metr module to at least one ESC per skate.
- Grab a paint marker and write “37” on a Mini Remote. Write “42” on the GT2B remote.
- Power up and pair all receivers, and set the failsafes, and set the throttle mapping and curves on every single ESC. They all need to be set.
- Connect to the bluetooth or metr with a mobile handset (with wifi connected) using VESC-Tool or metr smartphone application. Turn on TCP forwarding.
- On a laptop or desktop on the same wifi (or wired) network, connect to VESC-Tool and set all the left ESCs
VESC IDto 37. Set all the right ESCsVESC IDto 42. This is inApp_Settings > General. Write the changes each time.
to change remotes
- Connect to the skate with VESC-Tool using a forwarded TCP connection
- In
App_Settings > PPM > Generalchange both ESCs’Multiple VESCs Over CANsetting toFalseand write the value. Don’t try to get ahead of yourself. Turn them both off FIRST. ignoring this can cause you to have to open the enclosure and use a USB port - Now look at the remote in your hand, and whichever number is written on it, go to that ESC on the CANBUS, and set
Multiple VESCs Over CANtoTrue. Write the value. That skate is now using the remote in your hand and ignoring the other one.
So you can switch which remote is active in about 30 seconds…
enjoy…