After Lane decided to modify his steering wheel with his face, I started considering going with a seat with integrated brackets and 4 or 5 point belts. Lane found these and it looks like they would fit in a Beck (they have the most spacious interiors of any of the replicas), but not sure about an IM.
This would be far less tear up than a roll bar.
I winter my car at Special Edition, and when I considered it, the seat delivery timing wouldn’t work out for this calendar year, so I dropped it.
I’m also not sure that my butt would fit in the seat. I’m hoping that someone else can be the Guinea Pig :-).
I’ll reconsider this winter.