Well if Perfect World had something like Gender Change stone, I would add tradeable stone to the shop, just like I did with Identity Stone. But nothing like that exists and the only way to perform the change is doing it in user Panel. And since making Gender changes free could possibly cause big mess, it had to be donation option only. There is function to gift the points, but there is chance that you might be scammed sadly, if you do the transaction with someone you don't trust =/
So right now I don't see any other way to do this...