He got neutered and also got his ear tipped. I let him out the evening after his neutering and he was fine. Surprisingly he came around the house again the very next night. I carefully opened the door on a crack and put some food out for him. Since that day he came around every night at 9pm sharp and cried in front of the door for food. I was very careful not to touch him in case he decided to attack me again. I now basically had a feral cat that I was feeding, but at least the spraying on the front door stopped. I guess it was a fair trade - his manhood for regular food.
TBC.