Yeah, I'd have to agree, as great as it is to have two healthy specimens, it would seem ill advised.
I had a beautiful Indo Elegence, that my black occellaris took up residence in, besides his bta. After 4 months, the elegence's tissue didn't expand nerely to the extent that it could have. Another 3 months later it died.
Best of luck to you and your coral. For the long term health of the elegence, I'd discourage the clown from hosting in it.
Great looking piece! Good Luck