The best way is to have a system that has little chance of being deadlocked. Period!
Actually the only way to avoid taking serious government issues to the supreme/constitutional court is to make sure that at an earlier stage the chances of this happening are minimized. The clever way the presidential council would be chosen offers some reassurance for this, but because of the complexity of the whole Annan plan it is easy for someone to advocate otherwise, by constructing a worst-case deadlock scenario... and then it is hard to argue otherwise. And that is because the true deadlock-avoidance guarantee is good will and trust from both sides, that such a person many times lacks. Without these ingredients, even the most carefully constructed plan is doomed to fail.