Can We "Helsinki" The Iranians?

Michael Leeden writes in the Wall Street Journal that any negotiations with Iran over its nuclear program must also include a demand that the government in Tehran dismantle itself:

The Obama administration wants to talk to the Iranians, and some reports suggest they have been talking for months. American negotiators should take every opportunity to call for respect for human rights -- on behalf of the labor leaders demanding that salaries be paid, women demanding equal rights, students asserting their freedom to criticize, and even dissident ayatollahs, such as Montazeri and Boroujedi, who have branded the regime as heretical. Secretary of State Hillary Clinton would seem an ideal champion for these victims.

Above all, the U.S. must not make the mistake of limiting demands to the nuclear program. A free Iran must be the objective.

Given how much success past negotiations have had on the more limited issue of Iran's nuclear program, it strikes me that this, more far-reaching (and from the Mullahs' point of view, suicidal) condition is eminently reasonable.

That said, I take Leeden to mean that the U.S. should try to embed human rights conditions within its negotiating framework to ultimately undermine the regime from within, much as the Helsinki Accords provided Eastern Europeans with the moral ammo necessary to take down the Soviet Union.

This isn't necessarily a bad idea in general, but as I understand it, Helsinki occurred after there was already a long history of negotiations between the Soviet Union and the West, and after work was underway on nuclear arms control (SALT). There is no formal dialogue yet between Iran and the U.S. so wouldn't a more incremental approach serve us better?