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As an aside, I have two 12V (likely up to 16V as it is for a car electrics) to USB-C power plugs. I can then power the portable QHD panel via USB-C and the RPi4B via USB-C from 12V. A medium HDMI-regular HDMI cable on screen and adaptor to regular HDMI socket on the RPi4B. Then it's a sort of mad portable with not great performance, but Ubuntu+Mate and Calibre works on it with 7,000 books all off the SD-Card. Mine is only 2G RAM, so you really don't want LO Writer, GIMP, Calibre and Browser at the same time, which is fine on the cheap under €300 SSD Lenovo (2T HDD added after purchase).
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