You might find it cheaper overall to replace your alarm panel with a cellular-capable unit if you have problems finding a compatible system there.
It shouldn't be THAT hard to find someone to handle the directv setup, it's mostly just a matter of running the coax from the dish down into the house, it's really not a 'specialist' kind of job. There are a couple of home theater shops in the area, have you tried contacting any of them?
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