A thwack bot will be inverting so frequently, either by making attacks or by bouncing off opponents, that to be activating and deactivating a 'flip' function would actually cause more problems than it solved.

If it were me I would colour either side of the robot so you know which way up it is and learn to control the machine upside down from the start with no additional aids.

As a piece of history, in RW S3 Stinger went out in round one to mace after 2 minutes of mad, random and chaotic bouncing. Next year it ranked 3rd. With more driving practice the machine went from uncontrollable by the driver to unfathomable by its enemies.