Ah, I'm not sure how well that'd work via yuzu and ryujinx forks. Perhaps if the executable is added through the steam client so you could delegate the functionality via steam input? Sounds messy as heck though.
If you don't use them to relax your grip in specific types of games (delegating common functions to them and away from thumbs) you might like to use them for DVR capability like instant replay?
If your controller has a gyroscope, you may use them to toggle engagement? Gyro aim can be surprisingly effective once you're accustomed to it.
This may be at odds with stability somewhat being rolling release, but you may want to check out SUSE tumbleweed or EndeavourOS. You already have a solid pick based on your established requirements.
Couldn't hurt to poke around other offerings in a VM, though
2016 had the perfect balance between story and gameplay to me, in that the player character expressed flagrant disregard for any narrative elements. This was doom 1 af.
Just keep moving and turn the bad guys into chunks. Need nothing more.
I fucking hated the loop in eternal. I get that the developers wanted you to play in a specific way, they partially achieved this through arbitrary mechanics like ammo scarcity. I can appreciate that it's a good game, but I didn't get on with it.
The art style went full Hollywood horror, and the exposition was kinda dialed up to eleven by contrast to its direct predecessor. Very much disliked that you couldn't crouch (definitely more of a me issue, though I think sliding is a missed opportunity in Eternal's movement repertoire).
2016's PvP was imperfect but still fun and much appreciated. Snapmap was super underrated and has many sick community made levels.
The later games are a phenomenal technical showcase; the absolute posterchild for the Vulkan gfx API, but it's not very 'doom' in spirit to me any more
I feel that, I just wanted to set your expectations. I prefer and will continue to use CalyxOS but I have no expectation that they will deliver the same level of protections/mitigations at the OS side as Graphene given their project scope is different.
CalyxOS aims for a private, yet simple (attainable) Android experience, and I align more closely with their ideology on having a FOSS replacement for Google Play Services in MicroG.
I suppose one thing you could levarage is work profiles on Calyx to "jail" apps you do not trust, though I'm not sure that meaningfully builds upon Android 15s own application sandboxing.
Perhaps as a long term goal you could look into making a custom fork of CalyxOS for your device and incorporating parts of Graphene's hardening but this will be a lot of work.
lol