That is something conceivable. It gets closest to my desire for prison time. A real facility with all the limits of a typical prison, including bars on the doors, a crapper in the cell, limited amenities, and boring gray walls. No gold gilding or plush chairs.
In that kind of accommodation, SS would probably be the jailers. Yeah, no gen pop means little risk.
Oh I agree, I just think there will be considerable pressure on the courts to avoid actual prison. House arrest at Mar-a-lago or any fancy property he owns is insufficient. But I could see appeals go rapidly up the court system to keep him out of any real prison, even a “club fed”. And this Supreme Court, there’s no telling what they will do.