[team222badbrad]

If a company is modifying an off the shelf servo for continuous rotation then as an inspector I'd say it's illegal. It doesn't matter who does the modifications as per R33. Modification is modification.

If a manufacture (not a reseller) of the servo is marketing a servo as a continuous rotation servo then you might be in luck, but I'd certainly ask FIRST in the Q/A to be sure and bring the answer and servo specs to competition with you.