Eventually, there will be ROCK 2.0. And, I would assume that part of that upgrade would be the ability to boot UEFI, which the Gen 11 and 12 versions require. It has been stated as much in the “What’s coming in Roon OS 2.0” thread. As for time frame, no one but Roon devs really knows. They don’t give potential time frames.
I suggest get a NUC 11 or 12, load Windows or Linux on it. Use it until ROCK v2 comes out, and then decide if you want to switch. Windows and Linux work great too as dedicated RoonServers.