Most of the recent protons will be playable although it will depend on your tolerance to stuttering, it's certainly not as bad as it was but it's still pretty noticable. As soon as you plug it into an external monitor it goes straight back to being as shit as it was. I honestly have no idea how to explain the behavior maybe it doesn't like 120htz monitors or TVs.

I have been through about 20 different protons and tried all manner of vsync, power controle options.

The best one I have found is to use GE-Proton8-32 with the use of Powertools to set smt off and use 3 threads. You'll get a few minor spikes entering areas but it seems to smooth out fairly quickly. And it seems to work with both handheld and docked.(make sure your using a resolution setting with 60htz) Only caveat is that GE-Proton8-32 breaks controller support but a work around is to map it to keyboard controls (there's a community made one called Chrono Speedruns, might have to "Show all layouts" as it's listed as a duelsense layout).