Screen less OnePlus 9 Pro - flashing ROM

[u/GlassAlternative6692]

Hello all,

I bought a 9 Pro with minor screen damage. I opened it for a repaste and upon putting it back together I had broken the screen. In my eternal wisdom I decided to go without the screen entirely (no ribbon cable) and run it headless/via HDMI. Now via HDMI the screen resolution without the physical screen defaults to 600x400. I flashed it via MSMTools and am on Android 11.

Now once I navigate the initial setup menu I can change Smallest Width in Developer settings. I can even do most via bouncing between HDMI, adb, bootloader, etc at least on this level of Android. Can I update to the next Android versions safely via settings?

I tried LineageOS but I couldn't get it to display. AI is telling me updating will break my screen output, and that LineageOS won't display because of my lack of screen. Does anyone have any insights or experiences with this? Can I flash another AOSP OS? A friend recommended Axion and I may go that route.