Ah. Maybe it was the third row with the extra lap belt in earlier models, I don't remember.
In any case, seatbelt systems are engineered to a ridiculous degree, because they have to be. Personally, I wouldn't make any alterations to them. So I vote 'crazy'.
Early 80's, through '94 I believe, had 3 belts in the second row. The middle is just a lap belt, but it was considered good enough at the time, and if you're concerned about modern safety standards you should buy a modern car. I'd find an early set of second row seats before trying to rig...