Great idea. This would work...
Lets work out details.
Would you have to pay a royalty to the celebs for the "likeness"?
Absolutely not...like, for example, out Tina Turner doll might have a black eye from Ike, so Tina estate cant claim likeliness.
Megan Markle doll will have a royal seal tattoo to differentiate.
Madonna doll will have actual cone breasts.