Unless the rubber bumper on top of the subframe bushing has failed, I don't see how it's even possible for the subframe bushing to make noise. The through-bolt is what actually holds it to the car. That flimsy little frame is there more for locating and reinforcement. If it is actually rubbing on the car, try taking a screwdriver or pry-bar and reshaping it so it doesn't rub.

Not sure about the 123, but the 126 bushings can be pressed out and in without removing suspension components or dropping the subframe. If things aren't horribly rusted, replacing both is a 1-2 hour job