The National League of Cities website lists San Francisco as having non-partisan elections. Your proportional approval voting video shows Canadian political parties but I assume that you are proposing to retain non-partisan elections. I prefer non-partisan municipal elections since they reduce the meddling from state and national political parties. Your story is timely since I have been seeking a non-partisan process of implementing proportional representation. I will research and evaluate proportional approval voting but I question how a non-partisan ballot can achieve actual proportional representation.

One disadvantage of multi-seat (at-large) districts is the number of candidates on the ballot which increases the time to evaluate candidates and wait times at the polls. Staggering terms will reduce both and provide some continuity of governance. A combination of single seat and multi-seat districts is a good compromise.

I agree that single transferrable voting is more complicated than proportional approval voting when determining the winners but not in selecting candidates on the ballot. I doubt that either method results in actual proportional representation for non-partisan elections.