I saw it done on a truck at the starbirds show this year.
he eliminated the center bar too, but he used a larger trim piece so it still looks like a regular gasket unless you have one to compare it to, then you can see the difference. He did it like you said, urethaned larger glass in and used modern windshield trim that covers the small gap.
I have been into cars and trucks for a long time and in the 90s guys would do it with the front and rear-side glass on their VW bugs, the kit was the larger glass, urethane caulking, and trim. gave a nice finished and clean look to the cars.