OK thanks,
After experimenting some more with the LED displays, I'm probably not going to switch the red and green anodes separately as unfortunately the yellow-orange colour is not consistent with all digits. I'm favoring switching just the red anodes and having the green anodes with constant 5v. As I mentioned before, this works OK since the red dominates the green. Thanks to you I have lots of options.
This would allow me, as you illustrated in Hiker7 diagram that since I only need 8 lines from USB to switch red anodes, to use a 5v line to control circuit TypeC-Select Room. You had figured using 12v to control TypeC-Select Room, so does that make any difference with any of the resistor values as in the circuit diagram Hiker7 TypeC circuit?