LCD screen type

[renzenicolai]

Not a question or issue, but a starting point for developing a more integrated solution: the displays you're using are Sharp LS029B3SX02 LCDs (https://www.panelook.com/LS029B3SX02_Sharp_2.9_LCM_overview_27997.html). Datasheet: https://ds0.me/ds/LS029B3SX02.pdf

Maybe this information could serve as a starting point for someone to develop a proper integrated Arduino + displayport-over-usb-c to MIPI converter PCB for these displays.