Just do an enroute change of frequency to the Matz when about 10 minutes to run.
There is no actual requirement to talk to them as long as you stay out of their airfield ATZ but you'll be a fool not to especially with all that hardware potentially zipping around.
The service is friendly and first class.
Keep it concise and don't get too worried if they don't respond immediately, they might be working the military UHF frequencies that you can't hear on VHF.
Very often they'll automatically pass you on to the next service. You know that this is going to happen when they ask you to change the transponder code prior to the handover.
All you do then is report to the next unit "on frequency" when instructed.
Otherwise they tell you to "freecall" the next radar unit which means that you have to go through the formal introductions again.
All in all, nothing to worry about.
A very professional service.
B