Yeah, that's good enough. Some other clubs might gripe about it... usually, they don't. It's sort of up to the instructor. You just don't want to make them uncomfortable with a disparity in safety equipment. Sort of like, "Yeah, YOU'LL live if we go into the wall... but, what about me???"

With stock seatbelts for the driver AND the passenger, I don't think anyone would gripe about your seat.