Having has no success with my question BLE5.1 with on-board eInk (or any kind of display), I will contemplate an alternative.

Let's swap the display for wearability. Is there a BLE 5.1 dev board with battery attachment (preferably a cell type battery, but any is acceptable) - no soldering required?

Please note that it must be at least BLE 5.1, as previous versions, including BLE 5.0, do not support the AoA/AoD which I seek.

[Update] an on-board debugger would be preferable, although I can live with a JTAG probe (or even print over serial port)

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