I am thinking that a standard glue-in windshield uses adhesive designed to adhere the glass to the car body's metal.
IMHO, incorporating a flexible, subject to deterioration, rubber gasket into that glued joint would make that installation much less solid, secure, and durable.
Or are you somehow installing the rubber gasket after the windshield has been glued to the body?
Is there any standard production vehicle that incorporates such a glue-in/rubber gasket installation method?
I'm just not seeing good results from this approach.
Again, I may have missed something in a previous post. If so I again seek some clarification.