Congrats - both on your recovery process and being able to get to the car.
That said - following Treblig's comment - is it possible to get an entirely custom window made for the car without venturing into Six-Pack Resto prices?
Besides the fact that a new window would prevent having to cut a piece of tempered glass, the ability to get it made wider could help you keep the factory look of those pencil-thin A-pillars and stay in keeping with the sublimely subtle chop.
-Kurt
P.S.: This has to be my favorite chop of all time, I might add, if not my favorite A-body Barracuda on the whole site. Might even be my favorite Barracuda, and that's coming from a fellow who has worshiped the E-body Barracuda over the A-body since the age of 10.