Could you replace the bangle js square screen with a circular screen such as the one seen on the open source smartwatch by Paul3dThings?
Looks like it's using something like this: [https://www.aliexpress.com/item/1005001380147177.html] so SPI serial interface. So you might be able to drive it from an SPI port, but it's certainly not a plugin replacement or just a matter of adjusting the connection.
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
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