I wanted to jump in on this thread.
I had a mated pair of Ocellaris Clowns, but prior to having a lid... one of my cats went fishing one day and we lost the female clown.
The male having been alone for a couple years turned female.
Would introducing a juvenile be certain death or is there a possibility of pairing?
curren what lid do you have on your tank .
You should be able to add a juvenile without a problem. I had a single (female) alone for about 9 years and added a little boyfriend for her with no issues. As long as the new one is small enough to definitely not be starting the transition to female, you should be good to go.