Found a third candidate for a screen, the 5.5" Sharp LS055T3SX05. This one is 1920x1080, still plenty of pixels for a screen of this size. Reason I'm considering this one is that it can be found with a LCD controller that has 3.5mm audio jack to wire it independently. But also, I have found a quirk with my current 1440p LCD, that's impeding the potential for this computer.
As I've previously said, the default orientation is portrait. While it's possible to switch to landscape mode via software, the only available resolution for landscape mode for is the native 2560x1440. For desktop use this isn't a problem, but the iGPU is too weak to run 3D games decently on that resolution, and if the game doesn't support internal resolution scaling, you're pretty much out of luck. I was hoping to scale down from 1440p to 720p full screen resolution, but this panel does not support hardware scaling. On Batocera I especially noticed this with the emulators for more powerful consoles- Dreamcast, GameCube, and Wii games felt more sluggish and no software config can override the hardware setup, it always sticks to 1440p. The games would mostly run fine and at normal speed on a 480p panel.
It is why I will consider the 1080p panel as well. Far fewer pixels to draw and comes with its own audio out in the controller board, while still being less bulky than the Raspberry Pi screens. In retrospect I should've gotten this panel instead since 1440p is overkill for the size. I just jumped on that one because it was more readily available.
