Save your sanity: If you buy a PBP, buy a serial adapter and USB to eMMC adapter.
I found this interesting product "DSD TECH SH-U09C5 USB to TTL UART Converter".
It uses an FTDI FT232RL with selectable 5V 3.3V 2.5V 1.8V TTL level. Maybe it can be slightly tweaked to give a 3V output.
3.3V is ideal, no modification needed!

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