The constitution prevents the State reducing the pay of the judiciary. However, the relevant provision is correctly intended to stop politicians interfering with the independence of judges. Clearly those circumstances do not apply to the current economic crisis. As judges are part of the same class of overpaid top public servants as politicians, consultants and so forth, it is their duty to suffer pay-cuts (or however you want to describe the reductions) across-the-board.
I'd suggest the following immediate action by the government:
1. Specify in public an amount judge's pay will have to be reduced by. Say 10%, applying to all judges.
2. If even a single judge refuses to cooperate, or takes a challenge against the State, then the Government will set in motion a referendum to suspend the application of Article 35 for a period of no more than 12 months, thus enabling them to implement the pay cut through legislation.
That should get the message across to those who refuse to see common sense and see this as some kind of infringement of rights. Of course this kind of task would have been greatly simplified had the government from the outset applied these kinds of cuts to themselves and then to others overpaid by the public purse. But that shouldn't be allowed to detract from the duties of a profession which should above all be informed by ethics, fairness and social objectivity.