Like EagleAye explained
" Whomever the Iranians elect. The Iranian people are very educated and cosmopolitan and worldly-wise, and that's what Democracy needs to succeed. Democracy was(is) a struggle in Iraq, but Iran's populace would do a far better job at installing a new government"
The problem I see with this is a third party much like a foreign government would have to be involved to effectuate a proper democracy. A democracy is my goal as well. However I do not see where this country is ready for a true democracy.
For example, "Current Constitution adopted 2nd-3rd December 1979; significant revisions expanding presidential powers and eliminating prime ministership in 1989. Article 4 provides that all civil, penal, financial, economic, administrative, cultural, military, political, and any other laws must be based on Islamic criteria" That does not seem to allow for a true democracy where human rights would be respected.
Iran may however have some Phoenix missiles left they can load on their few F-14's and get some actual aircraft kills, but few and not for long.
I don't see what you could offer that would convince them to surrender the kind of protection nukes would provide them.