Have you done this cross before?
I find it amazing that people read something a few times "no SA cichlids can hybridize" and they take it as fact and don't even leave the door open that it just might still happen. I agree there are no known cases where this has happened yet, but I believe there are some combinations that are more likely to be viable and potentially produce hybrids. I agree that in this case it is extremely unlikely, but I would never say never.
One of my favorite sayings:
"The person who says it cannot be done should not interrupt the person doing it." - Chinese proverb
Good luck OP and let us know the outcome.
I know what you mean, but I did not say that no SA cichlids can hybridize, I said I see no way of this happening. There are SA cichlids that can hybridize, just look at festae for example.