BleckySo just poking around the various microcontroller options out there, it seems there's a few "newish" 5V capable ARM chipsets in the wild.
This would mean we can do away with the level conversion and interface directly with the LCD. One of these options is the ATSAMC21J18A a 5-Volt 32-Bit ARM Cortex M0+.
This SAMC variant further simplifies the DoMSnif which would just require some buffering for the UART TX pin:
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