If you want to save money from housing "good luck". DXB is "****ty" expensive. Regarding the school allowence, don't know if they pay it if your kids are not in DXB. Saving a lot from the FO salary is "mission impossible". At least from my point of view....
Edit: Having a debt there and coming back is a NoGo!!! At least you need to check in advance if you are in the system. If yes then you need to take some actions.