Thank you for sharing this! I am very interested in wireless situations for MIDI and audio, for lazy connection to speakers at home and also for quick collaboration with others while visiting their homes / studios. See for instance We're introducing Tracker Mini - #24 by icaria36.
Like you, live performance is not the main situation I’m thinking of. Too risky and demanding for a type of setup that is still quite experimental or expensive if you want to get it right and reliable. But to get rid of cables at home or while visiting other musicians, I wonder if the technology nowadays is already there and affordable.
Just curious, if you have the play connected to BT speakers and you press play / stop regularly, do you get a noticeable lag, big enough to annoy you?
Also, have you considered wireless MIDI out connecting with an external synth or DAW?