Hi there.
The USM-RC-2 has settings for the proportional channels so that you can set the max switch point to 100% . Most sets with Analog trims will be able to work IF you use reverse trim. i.e. Instead of adding trim you reduce it. A little counter to expectations but it will work. You will have to either use the USM's diagnostics to find out at what point you need to set the upper switch levels and then go to the proportional channel set up and adjust the tabs accordingly.