I like this idea as well. Actually, it wouldn't have to be limited to just a PIN. Technically anything could be entered in the field to link, ie. "Turret 1" or "Control Deck Door". Maybe even some sort of identifier to distinguish between master and slave wireless blocks. Maybe "M = Turret 1", and "S = Turret 1". That would prevent having to travel and C&V at all. I'm not even sure if M and S should be required. Just have them link and be done with it, but I know I wasn't able to get my conference room working unless I copied from Wireless block A to Wireless block B. It wouldn't work when copying Wireless Block B to wireless block A.
Wireless modules were used in my last ship, but the one I'm working on now (not released), the wireless modules play a serious, major role in the whole design. Without them, I wouldn't be constructing it (not sure if I could), so if the links break on it, it'll probably be easier to just spawn a new one from blueprint (although I haven't confirmed if this would even work).