More fringe kingmakers can be rather dangerous.

I guess Iceland, Norway and Denmark are extremist countries now.

The fringe king maker is the already the president of the United States under first-past-the-post.

Ranked ballots would be better.

Nope, the alternative vote funnels the votes to the 2 big parties creating the illusion of choice.

The single transferable vote is what you want. It’s ranked and proportional.