No matter the love/hate relationship the Brits have with the monarchy, there is a zero probability a mulatto grifter will be allowed anywhere near the throne as Regent or otherwise. Baby Succotash is a non-player, as well. Fortunately, Migraine Markle-Farkle wouldn’t want any job that looks like work.
The simple fact is Archie is in the line of succession, and if it came down to it, he would become King.
If he was underage, he would need a Regent.
At the present time, under the Regency Act of 1937, if Archie became King while under 18, his Regent would be Prince Andrew, as the next adult in the line of succession.
But under the Regency Act of 1953, if the Queen had died while Charles was under age, Prince Phillip would have become Regent - as consort of the previous Monarch, and surviving parent of the new Monarch.
In the extremely unlikely event a situation developed where Harry became King, and Archie became Heir Apparent (which he would if Harry was King) it is very likely a Regency Act would be put in place to make the Queen Consort (Meghan) the Regent in waiting for Archie.
The monarchy operates based on rules and precedent, that doesn’t pay any real attention to the individual personalities of the people involved.
a mulatto grifter “
Do you have a problem with her having some black in her background?
Hopefully not, conservatives aren’t that way.