The pre-determined ruling that you mention is called a Private Letter Ruling. The IRS does not always grant them, but I see no reason that they shouldn't unless the IRS has already given guidance on the topic in question. They cost between about $600 and $10,000 and that is just what the IRS charges. It does not cover attorneys fees for researching and drafting the request. They sometimes come back within a month or two but are often delayed six months or more. The more complex the issue, the more it costs and the longer it will take to get the PLR answer.
There are other options. First, it is possible that the IRS will give guidance on this issue as part of their annual bulletin. The possibility is made higher by the fact that one dinar investor attorney convinced another dinar investor attorney to draft a recommendation to be placed on the Guidance Priority List. I am the one who did the drafting and submitted it to the IRS. I have posted the text here:
Your second option would be the PLR as discussed above. The third option is simply to determine with your attorney and/or CPA what the law will support you doing and do it. You will of course discuss the potential of the IRS disagreeing with you and what to do if that happens (i.e. pay up or fight).
The way things stand now is that it is evident by drafting in the regulations that the intent of the governing law (section 988) is to have you pay ordinary income on any currency exchange gains unless there is no business or investment intent behind the exchange. In our situation there most certainly IS investment intent and therefore we would fall under ordinary income. However, there is an exception drafted into section 988 for "personal transactions" for things such as travel. Those are given capital gains treatment for gains and any losses are not reportable. The question for all of us is "can we escape the intent of the law and fit into the exception because of the letter of the law (the way it was drafted)"? (For more information on this see the IRS submission at the link above.)
Also, the only reasons to have this information before you exchange are 1) IF you can in fact claim capital gains treatment, it might be worth holding dinar for a few more months to move from the short-term (35%) to the long-term (15%) category AND 2) if you are trying to determine if you will use charitable planning vehicles such as a charitable remainder trust or gift annuity it would be important to fund either with physical dinar instead of with USD. Therefore it would be essential to make the determination about whether it would fit your plans to use such planning before making and exchange.
Outside of those reasons, exchanging will not make difference (that I can think of) as to what your eventual tax treatment will be.
Hope this is helpful.
Best of Blessings,