I think you would really have to contact some surgeons and ask them. Usually I think you'd require some growth down there for them to do meta, but I am not sure. Maybe you'd be big enough without T for them to do it. You could also consider going on T just long enough to get that growth then stopping, or you could consider phallo.
But yeah you'd need to contact the surgeons' offices and find out from them. That's the most accurate answer you'll get.