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Removing sanctions and embargoes that the EU and US have with Iran will be enough of an incentive for Iran to regulate their nuclear program
The power Iran would gain from having nuclear weapons would outweigh the incentive of removing sanctions and embargoes
Regardless of the incentive that may exist in Iran, their government is too unstable to guarantee the regulation of a nuclear program in the future.
If Iran further instigates international powers with their nuclear program, the embargoes, sanctions and political tension will turn Iran into a state like North Korea
You should trust nothing when it comes to government(s). They are too fickle. That being said, diplomacy is the only way to reach a reasonable solution for all parties, with regard to nuclear arms. We are better off working with them, than waging war on them, and thus stirring up more bad blood.
This has been seen as effective in Egypt and Yemen
Without a strong international backer(s), Egypt and Yemen have began spiraling into turmoil again
Nuclear Deals have never been proposed with Egypt or Yemen