Why do you think Micro USB is not a “industrially reliable” connection?
Could you share your experience?
Some USB hub with external power(like attached picture) may help you.
They all have qualified & safe. Also, it provide a separation between your devices to computer. Once something wrong(electrical), your computer(e.g. NB) still keep in safe.
Another choice, you could use battery port(4.2V max.) to apply at CN802.
Except battery, you also able to uae DC power supply (3.4V ~ 4.2V). For me, I always use 4.0V.
Of cause, necessary confirm the polarity before use.
One battery spec. is attached for your reference.