I got the windscreen out this weekend - thank god. Thanks for all your input. This reply is to bring this thread to closure for those searching for some help on this topic.
After a couple of days of soaking the post/bracket connections with penetrating oil, the post still seemed stuck in the bracket. With the bracket bolts loosened, the bracket would slide (i.e., stay connected) with the windscreen post when I lifted the windscreen.
I figured if the bracket could be held in place while I lifted the windscreen, the windscreen would come out. So, of the two top bracket bolts, I retightened the one towards the front of the car (on each bracket). This bolt only holds the bracket to the car - it doesn't tightened the collar clamp as the adjacent bolt does.
Upon tightened this bolt (on each bracket), the windscreen slid right out.
Next I stripped the dash pad off and removed the adhesive. This was an easy job once the windscreen was removed.
In retrospect, after I got the windscreen out and saw how the upper dash pad is assembled in the car, I don't see how you could do this job without removing the windscreen.
Cain