My simplest solution to this is buying a TV panel. If all your OS-level and panel-level mitigations fail, and any burn-in bothers you too much, just sell it on the used market. I specifically bought an LG C-series 42" OLED TV for my gaming/work monitor use, and if/when burn-in becomes unbearable, I'm certain it can be sold to someone for a reasonable price. They'll likely use it as a plain TV and sit too far away to even notice any burn-in. Might be more difficult to pull off if you buy gaming-oriented smaller panels, so I advise against that.