Lower your expectations, like… drastically. First, this is what I used for my test (quite fun even if clunky, can recommend) and as you can tell, not exactly pushing any boundaries graphic wise. Then I installed SteamVR (obviously!) and https://github.com/alvr-org/alvr to use my Quest 2. In ALVR I set the resolution to the minimum and 60 hz. Once everything was working, I went inside to SteamVR settings and… dragged the resolution to the minimum. Text was still legible in game, everything was very pixelated but usable, and the FPS kept around 60. Do note that it’s enough to give some people motion sickness, not me fortunately, but you really want to target 72 or more. In all of this the Deck was roaring with fury (docked) and as my amusement worn out, I just uninstalled SteamVR and Taskmaster because it’s really not worth it especially since on the other side of the desk I have a gaming computer.

tl;dr works but just barely and expectations needs to be very low. Not worth it aside from curiosity.