hum, so maybe with "under this constitution" could still let someone have a federal office and a regional office at the same time.
Or the federal constitution is above the regional ones and the federal level mostly bans dual officeholding so for both levels.
Thanks for bringing this up, Poirot! In retrospect it is an issue in which I should have placed greater emphasis, as the Amendment is meant to prevent regional officers from also having federal office as well. It should be noted the Amendment asserts "offices under this Constitution" indeed, and the Constitution in Article II, Section 1 mentions " officers of its government" (regarding the regions), so I would certainly consider it as applying to those.
However, an exception I did fail to account for is that of being Speaker or Election Administrator, and I will certainly request the House (as it looks like the Amendment will pass the Senate) to pass an amendment to account for these regional offices to prevent what would be going too far in terms of a multiple office ban. But to me it remains clear that regional officeholders should not have federal office unless in the exceptions currently cited.
