I would never do anything other than keep them as comfortable as possible, feed them what they want, and let them enjoy their golden years. I have a male A. avic right now that is seven months past his ultimate moult. He survived two matings, and is back home and will recieve tender loving care until he is no longer with us.
if you have the oportunity to breed the male to a female, then that is the best course of action. At the very least he has a chance to go out in style and if lucky you later get several of his babies to raise up in his honor.
More often then not I mate and mate and send to mate till he gets eaten. Once and a while with a special male that I raised ill mate him a lot but when he starts to slow down and is on the downward slope I freeze him and cast him in resin.
mate him of course. i've never keep the males, i send them on their way to the next female once they have mated with mine. i've never had a male eaten yet (i'm ready with tongs in hand ) , but several got eaten after i gave them to friends or breeders. i guess i would freeze a male when he started dropping legs or death curling though. a shame to waste a good meal for a female, but i just don't like the mess it makes and prefer a quick death.