The UR22C runs plug and play on my Linux installation (manjaro, kernel 5.6.12-1).
But the dspMixFx application won’t find my device in wine. Which was to be expected I guess. (https://www.steinberg.net/de/support/downloads_hardware/downloads_ur_c.html)
If you don’t plan to provide the tools/drivers/dspMixFx for Linux, could you please at least open source them? People could try to make it work and provide a running Linux version of it on github, so that the DSP can be used in Linux as well. Creative also has open sourced drivers in the past (https://www.phoronix.com/scan.php?page=article&item=creative_xfi_gift&num=1)
That would be really neat.