I would just call up the airfield telling them of my intentions and tell them that I intended to "transit through their overhead at **** feet". Once they know your movements you can then just say that you will be "changing en route to ***** MATZ on ***.**" frequency. They are hardly not going to let you and they will also know who you are when you pass overhead.
It is probably worth mentioning to the MATZ controller that you have informed the aforementioned airfield of your route.