I would be an interested buyer (at the right price of course) if it could be done properly. The idea of the full balance of coins in escrow (as per TwinWinNerD's proposal) works. In the options world this is called a "covered call" because you are selling the right to buy an asset which you already hold so your obligation is covered.
Even if the interest is not there yet, it will come. This is a necessary part of any developed financial eco system. It also opens up massive potential for hedging bitcoin to USD for payment processors and companies accepting bitcoin.
Let us know what size call you might be interested in buying and over what time period. I will have a go at pricing the option and if we can agree on a fair value then we can deal or maybe TwinWinNerD and I can take half the action each.