Let's assume that we have two options on how the presidency issue will be resolved in a future peace plan:
a) A collective presidency like we had in the Annan Plan. There would be four GC and two TC members of the presidential council, all seeking election together as one team, and decisions would be taken collectively, by majority vote in which at least one GC and one TC agree.
b) A rotating presidency, as follows. A team of one GC and one TC would seek election together for the presidency, and the winning team will share the presidency as follows: The GC would be president for 40 months, in which period the TC would be Vice President and Foreign Minister, while the TC would be president for 20 months, during which period the GC would be Vice President and Foreign Minister. All executive decisions would be taken by the President alone, whether he is GC or TC, except for a very short list of critical decisions where the consensus of both the President and the Vice President would be required.
I know there might be other options for the presidency, but to keep the vote results simple I only offer the above two for now. If you wish, feel free to propose other alternatives.