Then there is no need to separate the Senate elections from the Presidential. Either we operate with one ballot for all races, or a separate one for federal and regional governments. I don't see how my amendment had anything to do with an electoral college, all it does is consolidate ballots, which is a good thing. The election would remain the same other than who opens the booth.
I mentioned an electoral college only because would need to decide how to tally the regional results. Due to IRV, the results of a vote counted separately in each region would not be the same as the result if it were counted nationally. So you could have votes counted in each region, and then the total number of each region's winner post-IRV calculation be added, with a national FPTP between up to five candidates. Or you could have an IRV last involves only those candidates that weren't eliminated in each region - which would mean a candidate could be counted at the national tally with votes from one region but not from another, even if the candidate had received votes in both regions before the regional IRV calculations.
Aye on the current amendment.