I don’t think you necessarily have to get Florida registration if it’s just for a few months. Legally, yes you are supposed to, but I don’t see how it would be enforced. There are plenty of vehicles visiting that part of Florida from other states, so it’s not like yours will stand out.
Moving is hectic enough so you might not want to add to that by having to get a new car in the middle of it.
the only way i know of that you can potentially return a car in one place and pick it up in another is if the dealerships are affiliated, like Autonation for example, who own a whole bunch of dealerships. Probably unlikely to find a MN dealership who is part of a FL chain but maybe worth looking into.
Return it to the dealer. Porsche lets you return a leased car to any dealership. They call it ‘grounding the car’ when you give it back. They have pull ahead programs as well and during my last lease they said I could ‘ground the car’ at any dealership if I wanted to use the pull ahead program…