As I pointed out elsewhere in the thread, the IAEA requires notification six months before coming on-line of such facilities. (The IAEA delegation first visiting the facilities in 2003 did point that out.) The heavy water production facility was supposed to come on-line last year. Also note that the Arak facilities were originally to be sited at Esfahan, and the decision to move them seems to be related to the need of much water that is awailable at Arak.

posing a possible threat to the neighbouring regimes

Since those neighbouring regimes are under the US umbrella, in fact the two largest neighbours are under US occupation and two more plus three near-neighbours across the Persian Gulf have US troops stationed at bases, attacking them with nukes would be responded by the USA.

the first priority seems to be the issue of non-proliferation.

I don't think you can deduce the level of importance or the order in time of fulfilling obligations from the numbering of articles. On the other hand, I submit you do have a point in that the wording of Article VI points not to the immediate future, in fact demands a separate new treaty on disarmament - but that "at an early date".

if disarmament was the priority

Disarmament was the end goal, and my argument is that disarmament of existing states and non-proliferation go hand in hand: dozens of new countries would not have the incentive (or at least have lesser incentive and rhetorical excuses) to turn nuclear if disarmament of the rest would be on-going (or at least they stopped issuing first-strike threats).

Even so, I do find many of your points intriguing and being quite plausible reasons for the seemingly defiant mood of the Iranian regime.

Upon re-reading I often find my own words offensive-sounding, while when I wrote them it was just a terse way of putting my opinion, and when there were points of agreement I haven't acknowledged them. So hereby I also state that I, too, find your points, and also points of others I responded to critically, intriguing and worth for consideration.

_{*Lunatic*, n.
One whose delusions are out of fashion.}