Why can't we establish our own royal house. Everyone on the electoral roll goes in a lottery, winner is the new monarch.
You need someone who knows the rules and conventions behind Westminster style democracy. Much of it is unwritten. I wouldn't want Kylie from the local bakery shop to get the gig if she knows * all about the practical workings of government, nor any of the proper official pomp and ceremony type stuff which the person would inevitably have to do too. Need someone with the proper manners for hosting foreign heads of state and all that.