A vinyl top can indeed hide a multitude of problems. I once put one on a Pontiac Sunfire which had the roof crushed from the hood blowing up. I just hammered and dollied it real nice and laid the top on. You couldn't tell the roof had been bent.
I used to help an old-school upholstery guy who sewed his own tops from regular roll vinyl. He would sew either single or double seams depending on the application. I think your top would look fine without any seams. You can glue it on with 3-M heavy duty spray adhesive but the old guy used Formica brand countertop glue sprayed through an old paint gun. You couldn't pull the top loose either after you rubbed it down!
I also think it would look ok to put it on as you describe. Sure, it wouldn't be 'factory' but most non-Mopar guys wouldn't know the difference.
You used to be able to buy universal aluminum trim which could be bent on a special curved board to fit any roof. It was then cut to length and snapped onto plastic clips which were attached to the roof with screws. If you were doing a 'fancy' car you could use a vinyl trim which matched your top color. It snapped onto a bendable rail which was screwed to the roof.
You might find an old-time upholstery top with enough trim and clips to do your car. I'm not sure where to get it new anymore.
Dallas
missourimopar.com