Switching Power Order?

Hi, is it possible to switch the power order of the cube? i.e. USB, Power 1, Power 2. Would that be a hardware or software switch?

It’s a rover that will be constantly plugged into computer to log, but if the computer battery dies would still like to navigate back home.

Currently I run a battery powering the cube and a separate battery powering the drive train.

Thanks for any input

The switch order is not really important, it will use the next power available that’s good… ie, if it starts with 3 power sources, it will pick the next good if it looses one. 1-2,2-3,3-1 etc