Would you please inform Louis XVIII of that.
Well, if Louis XVIII chooses alone, he will make a choice acceptable for the UK. Which means a psanish Bourbon renouncing his rights (for him and his offsprings) to the spanish throne.
Would you please inform Louis XVIII of that.
There is a big mistake. No foreign power is going to decide who becomes french king. The french are going to decide by themselves and to make a choice acceptable for the UK and that is all.
It is easy to have a spanish Bourbon renounce to his rights to the spanish throne. This is what actually happened for the ancestor of the man whom french "legitimist" monarchists call Louis XX.