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I think RoI should join to NI (resulting in entering the UK) then with the weight of their majority they hold a plebiscite and the whole island secedes from the UK.
Getting them protestant is a futile endeavor.
Maybe after Brexit NI secedes, they fund ISIS in Ireland then - since RoI isn't NATO member - they just simply move in as peacekeeping force, and gradually dismantle the administration of RoI while they assimilate the governing branches into the Ulsterian establishment.