Hi Kim,
I totally understand your situation. My is not much different. I talked to couple of MA regards this, now. As long as you dont work 24month there is no guarantee to keep PR. If you can survive untill July (to have 12months) you should be fine.
Or your boss and you are not telling anyone and hope that they don't check with tax office. I will try not using this option, I just invested too much money in getting my 187 and don't wanna risk it.
Have you thought about just working less? I think there is not really a minimum what you have to work. But I could be wrong.
Best J