Is rearranging constituencies something that would count as a different voting method? France used to use groups of regions, IIRC, as their constituencies, but starting this year they'll elect all 81 MEPs from a single nationwide constituency. This will probably affect the seat distribution (a little, not a lot).

Also I have a comment that's kind of a minor peeve with an otherwise great market, and I don't think there's any need for a change or anything. STV is quite a different beast from all other criteria, and moving from, Iunno, Saint-Laguë to D'Hondt feels like a much smaller change than if any country ditched these systems for STV.

In fact, to combine my previous two points: I think France's decision might reasonably count as a change for this market, but merely redrawing constituency boundaries in an STV system wouldn't - it is an inbuilt trait (bug?) of the system that you need to keep adjusting it every two or three elections.

@BrunoParga I mostly made this question as a way to measure "election system innovation", and as the EU parliament election has a lot of different methods in use and members which can change method independently from each other, then it seems like a good measure. But about changing the number of constituencies, I don't really see it as a change to the electoral system. It's just like having a lot of smaller elections, right? And even if it counted as a change it wouldn't matter for France, as they just made themselves more similar to other countries.

You write as if just a country just changing their electoral system is important, but it could still resolve NO even if a country changes their system. It only resolves YES if they use a system in 2029 that wasn't used by ANY country in 2024. Maybe I should make that more clear in the question.

Good question though, I hadn't thought about constituencies.