[AndyBare]

Usually when robots tip over [unintentionally] they aren't fouled for changing their orientation on the field, or having "sideways bumpers." just something to consider.

R22: BUMPERS must be located entirely within the BUMPER ZONE, which is the volume contained between two virtual horizontal planes, 4 in. above the floor and 12 in. above the floor, in reference to the ROBOT standing normally on a flat floor. BUMPERS do not have to be parallel to the floor.

This shown, I believe you can have sideways bumpers, as they do not have to be parallel with the ground; there are no rules stating that tipping changes any configuration of the robot. There is also no limit on horizontal extensions, so you can put wheels on that flick outside of the frame perimeter up to 15 inches, which you can fall onto. (Careful with those measurements though, as you still want to go under the lowbar)
I believe this is legal.

[edit: Also, remember that "normally on a flat floor" is simply how your bot sat during inspection, as "R" rules are primarily guaged as inspection rules. That being said, "normally" is in starting configuration, and also the bumper zone is applied to your robot in starting configuration. Your bumpers do not need to fall within the bumper zone after tipping. Literally speaking, there isn't even a penalty for violating R22 on the field.]