Great idea I still prefer the usb hock up personally for the reason mentioned above.
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S
Why do you need a switch? I dont see any reason for needing it. It should work just fine as a Y adapter without a switch. I havent done it with the MMM this way, but I have done it with the R1Pro that way. A Y without a switch.
The only reason I can think that it wouldnt work without the switch is if the internal BEC gets powered with the USB and tries to power the Rx. I wouldnt think so, but possible. It may work any even if it did power the rx as long as you dont turn your radio on.
I can't decide if its more fun
to make it...
or break it...