I will say my opinion on this: TJ wants to keep the CBs rare, right? Some ''new Hollies''. Keep CBs rare. No more CB Alt Sweetlings to anyone. Let them breed Black Sweetlings too. Like Solstices. But 2nd gens will be rarer.
Original owners can dump a CB Black Sweetling and take a Pink one. No turning back. Black breeds black, Pink breeds pink. Black Sweetlings owners can get Pink by trading. Same do the no-alt owners. In the end, the hatchling doesn't change its colors depending on scroll.
And everyone is happy. Though I don't mind any other solution, I'm okay with removal, them staying only to the original alt owerns etc.