About unconditional inspectors, first of all who does? the USA? England? France? those who want Iran to permit such inspections firstly ought to disarm themselves and then force Israel to join the NPT., as you know Israel possess hundreds of nukes and has got military nuclear program (without any inspection), space program and has invaded its neighbors in many cases since its creation. Notion of "
The Middle East to be a nuclear weapon free zone" has made no progress since Iran proposed the idea almost 40 years ago Israel is the only middle eastern country with a nuclear arsenal, which was developed in the 1960s. Israel has opposed even discussing nuclear demilitarization moreover Iran has called for nuclear weapon armed state to disarm... none of them has achieve their goals ...
On 20 percent, and any possible high level enrichment in Iran ... simply base on NPT it's our right .and we've enriched uranium up to 20% for Tehran research reactor. we asked the IAEA to give it to us and they didn't, consequently we did it by ourselves due to lack of time, as you know around 1 million Iranian patients consume its output (drugs,isotopes).
FYI there is an additional protocol to the NPT which gives the IAEA even more authority to inspect sites, from 2003 to 2005 Iran voluntary agreed to this higher standard (the
additional protocol) but when we didn't get anything in return from the USA, Iran stop hearing at that protocol so what Iran does today is it hears to letter of the law of the NPT treaty and does not any thing extra.
Iran has repeatedly issued that it has not any plan to acquire a nuclear weapon furthermore Iran supreme leader has issued his own fatwa (religious edict or decree) against having nuclear weapons that "Any effort to the production, stockpiling, and use of any type of WMD such as nuclear, chemical and biological weapons are forbidden under Islam and that the Islamic Republic of Iran shall never acquire these weapons."
In sum, nuclear program for peaceful purposes (enriching uranium in any level, research and so on) is our right as the USA, France, England, Japan, South Korea, Brazil, Argentina, Russia and China do.
And international community have this right to observe and inspect our program.
I think that's a fair deal.