It isn’t “just“ misconduct in public office. It’s a serious offence. I’m not certain that being a member of the royal family is, in fact, a public office, but if he has abused that position then that strikes at the heart of the whole reason for the existence of the royal family. As has been previously noted on here.
Isn’t it likely that KC3 had advanced notice of this last year when he began the moves to unroyal AM-W?
Acting on behalf of the UK government for business interests is what justified his public existence and payments. If there was an offence, and it’s by no means clear that there was, then it was one that was committed in this country and he would be put on trial in this country. And punishments would be served in this country. Weighed against the Epstein debacle those would seem to have far more chance of success, though the Epstein emails may well contain evidence that might be relevant.
I just don’t think the Epstein thing is going to go anywhere as far as Andrew M-W is concerned. This one might have legs. If there has been an offence of misconduct, then it was when he committed against the whole of the UK.