No, DRG doesn't have a native linux version. The "force specific proton version" setting not being on will result in the latest stable proton version being used. (which at the time of writing is 8.0-2) Which is known to work for DRG ...
I think it's really stupid that Apple didn't make a wired version of the Magic Mouse, some people hate batteries more than wires. Especially that an iMac doesn't need many wires in the first place (for the display and ethernet and all that usual PC stuff), one wire isn't goin...