Second option for me, maybe leave in the biggest one with 0.625 as well for people who are OCD about having a place on their station absolutely anything can dock to. Also, there should maybe be some advantage for the Non-Androgynous Docking Port in later game, such as abuilt in radial chute or toroidal rcs tank. Finally, from the way it looks, I had the idea that the Male docking port should be able to shoot out a docking hook, simmilar to KAS pulley shot, that would have limited homing on the targeted Female port, and then be pullied in for actual docking. I know that's quite a lot of new functionality, especially the homing part, but that's what the model inspires for me. Edit: A much more realistic option would be making it exactly like a pulley+attachment node from KAS, so it can be shot in the general direction, captured by a kerbal and attached into the docking port.