I always take the chance to boost my proposals, so here it is, my proposal for a fix to the voting system.
Basically, the proposal is AMS with a “second mandate” system, whereby your constituency candidates who don’t get elected make up your additional member list. This means that you don’t want paper candidates (because they might accidentally get elected!) and that even if your candidate does not win, your vote can help to get someone from your preferred party elected.
I don’t think that there is a better solution here. Mostly because any other system would see the state determining who is and is not worthy of standing for election, and that would be very dangerous.