Given that for the past 100 years no Leader, etc has come up with a better idea.
Even better, if the Plant-talking Leader wants to dismantle the system that confers the Leadership upon them.
The Commonwealth is a very good thing, as long as the 'wealth' part isn't thought of in monetary terms - but more the wealth of ideas found within the Commonwealth.
And so too can all Commonwealth Members be Republics, no need for Monarchs, but a Leader that 'talks to plants' seems very qualified in 2022.