I'm not sure this is something I can get behind for a couple reasons. I think the biggest impact (and only real impact) this has is with the NPC elections, so I'd rather keep one uniform system throughout the region for elections that are part of NPC to create easier work for Lumine.
Any other downballot races, though, I don't see why the regional government should be placing restrictions on what voting system they use. They should be able to make that decision without regional interference. I rather don't like options 2 and 3 at all and would be huge deviations from current systems, so this would basically be giving people one "familiar" choice. If an entity wants to use the system that elects whoever wins a plurality (which 95% of US elections do) I don't think we should restrict that.
I concur with these points