A loyal British subject gaining a position of influence in this nation and calling for the disarming of American citizens would not have been smiled upon by the Founders. The quaint notion of everyone having the same rights as American citizens, even unto calling for the end of those rights, had no currency at the time. He’d have been run out of the country at a minimum, as happened to so many Tories at the time.
I’m not entirely sure that is true, either, because the Founders expected the Constitution and the Bill of Rights to apply to Tories as well. I’m interested, if you have some citations to the Federalist Papers or other sources, to continue.