No disrespect, but why would the UK - as a sovereign nation "have" to elect anyone to do anything ?
There are a myriad ways to run a country without a monarch.
Tony Benn always noted that the "case" for monarchy was always made by the fiction there was only one alternative.
And frankly, the whole "You can remove a president" line is really looking a bit wrong, as we cast our eyes and minds westwards.
If we have to have an elected head of state, it would be trivial to ensure they have never stood in any capacity previously. If you want to be president then you come in with no party political affiliations. Which fulfils the truism that people who seek power should under no circumstances ever be allowed within a country mile of it.