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Replying to @enzinolombardi and @adafruit

okay, now you’ve nerd-sniped me. searching DigiKey for BLE and sorting by smallest yielded two interesting possibilities (one admittedly marked obsolete):
https://www.digikey.com/en/products/detail/dialog-semiconductor-gmbh/DA14531-00000FX2/10474881
https://www.digikey.com/en/products/detail/asahi-kasei-microdevices-akm/AK1595/12418132

(original)