I'm renting a garage, and it gets too cold in the winter to work comfortably. I ordered an electric 30 Amp rated space heater but realized that I have a 50 Amp, NEMA 6-50r receptacle. Obviously I cannot just use a straight-through adapter or different plug because that would defeat the safety of the expected 30 Amp breaker circuit. However, would it be safe to create an adapter where it goes from a 6-50p pigtail, into a circuit breaker box with a 30 Amp breaker, which is wired to a NEMA 6-30r receptacle? All this would be using properly sized wire and grounding of course. Being a rented space, I don't want to be installing any permanent fixtures.