If you absolutely want a work-around for the 90/120% FNMA REO Clause (#14 I think):
Use an LLC to purchase the FNMA home.
Then just sell the LLC - whenever you want to - in that 90 day period.
Using an LLC provides additional layers of protection and, perhaps most importantly, the property runs with the LLC, so that clause #14 is not compromised.
I highly recommend including a disclosure, for YOUR buyer to sign, that clearly outlines that the property may NOT be sold, out of that LLC, for the remaining period of the original 90 days/buyer cannot borrow more than 120% of the original purchase price from FNMA for the remainder of that 90 day period.
The LLC ? You can sell it for whatever value you and the buyer agree.
Your buyer will be able to sell it, out of that LLC, at the conclusion of that, original, 90 day period.
Now - the above info is my opinion.
I am not an attorney.
I recommend you consult a real estate attorney for the finer details before you make my solution yours ; )