I'm afraid this a real grey-area. You can normally enter Iran without a carnet, though I've only heard of people doing it coming from Turkey or Armenia. What the deal is for export plates, I don't know.
I would suggest you speak to the embassy in the UAE, and also contact ITTO in Iran - the Iranian Touring and Transport Association. That said, Iranian borders are usually flexible (read bribeable), so you could try that.
There are hundreds of Afghan / Pakstani traders who import used cars to Afghanistan / Pakistan, though they are put on trucks through Iran. Maybe they can help you if you can track them down.
Can't you get a Saudi transit visa??
Daniel
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