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@Gordon
Hi - I think this got asked before, but yeah, it wouldn't be plug-in. You could potentially make a little adaptor PCB and new firmware though. The Bangle's LCD is 8 bit parallel, which means that there is plenty of IO left on that connector to handle SPI.
However, on the nRF52, the SPI's max speed is 8MHz, and so screen updates won't be very fast at all - it's why the Bangle uses parallel