That's amazing! Thanks for posting up!
It's always been the battery that seemed tricky in tiny devices, but actually those MS920SE/ML-920S seem really promising. Did you consider wireless charging? It might be that a few loops of copper around the ring and then a diode (and 3.1v zener to clamp the voltage) would be enough to charge the battery - and it might let you save some space.
I've been wondering if I should start stocking pre-programmed MDBT42Vs? They're really cool but you definitely need a hot air gun and paste to get them soldered!
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