A couple of thoughts....
Operating without ADSB in that part of the world might not be a great decision. You could make it "legal" but it might not be salfe.
Even if you get an exemption - in the heat of the moment ATC may not accept it:
"An ADS-B deviation authorization granted using ADAPT does not equal, nor does it guarantee, an ATC clearance into airspace where ADS-B Out equipment is required."
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Round here in New England you will get it if it is to make a trip to an Avionics shop for a repair. But it is not given as a sort of "routine" way of operating without ADSB for a non-equipped plane. Attending something like SnF would be considered "elective" and you should equip. At least around here.