Just legally change Lilibet's name to 'Princess.' Problems solved. And I ain't even one of them 'smart' Royals!
Update...
https://www.express.co.uk/news/royal/1670350/King-Charles-III-Prince-Harry-Meghan-Markle-Sussexes-Archie-Lilibet-titles-latest-news-vn
Looks like they’re playing chicken...