Consider: In 1688, it was sufficient that James Stuart, the King of England, Scotland, Ireland, and Wales, was a "Catholic" for Parliament to alter the line of succession, kicking James off the throne and alienating his son James Edward and grandson Charles Edward from the right to the throne. Instead, Parliament sent for the Prince of Orange (William) who was married to a plausibly Protestant Stuart (Mary) and installed THEM as co-sovereigns.
NOW.
Recall that during their Oprah interview, the Dynamic Duo said that someone in the Firm made a "racist" remark about Meghan's pregnancy. They slyly declined to name the "racist", other than to say that it was not Harry's grandfather.
In 2021, in Cool Britannia, being a "racist" is much, MUCH worse than being a Catholic was in 1688. Also recall that there is a "secret book" in the book deal, not to be published until after HMQ is dead.
The obvious play is to reveal that it was Charles, or William, or Kate, who uttered the horrible, unthinkable, "racist" remark. Can't have a "racist" on the throne, now, can we?
We CAN, however, send for the King Over the Water (Harry), and, just to make sure the throne is purged completely of "racism", we can install Meghan as the regnal Queen she was born to be.
A new William and Mary for a New Age of Enlightenment.
Bet on it.
Your scenario won’t ever happen for many reasons, one of which is that a large majority of Brits now loathe Halfwit and MeGain. Their secrets, lies and antics have resulted in increased popularity for William, Catherine, Charles and even Camilla.