That's a good question.
1. Iran is NOT on a Visa on Arrival or Visa Exempt list, so a border bounce won't be possible
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2. According to the attached list from KL, Persians need to return back to Iran to get a visa - IF they are applying from KL. I don't know about other embassies though. EDIT: Same policy exist in Laos, so that isn't an option either.
3. I don't know what the requirements are to get a visa from people from Iran. Sadly, the Embassy's website in Iran isn't that helpful :(
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4. In other countries, they are strict about getting a tourist visa, and want to see 6 months bank account balance, a return flight, etc. See
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for an example of the requirements.
The safest would be to get the extension, getting a tourist visa is too tricky I think.