[Bandgeek80001]

My best suggestion:

Bring it with you as part of the withholding allowance, and have everything you need in order to mount it and cut back the robot's weight. Play a few practice rounds, and watch the rest. Watch carefully to see what kind of effect the arms seem to be having at your event.

This way, if it seems to be a pointless thing to add, you were ready, and if you think it will help, you can throw it on.

(Also, after the competition it would be a cool thing to show potential sponsors once you've perfected it.)