I have thought about the same problem before. Cause i might need to buy special plate number with the special Alphabet before got enough down payment for the dream car. Right?

Problem is, how are you going to keep the plate number to not expired. Well I've thought of a way but not sure it works or not, that is to get a very cheap or any old vehicle (motor perhaps) and register the new plate first (this will abandon the previous old plate of that vehicle). Then when you got your destinated car, change the plate again at JPJ.

Hope it works..