I screwed up, neep help

Working on my 66 Dart. I started polishing some of the trim that goes around the back window and I see that apparently the trim should have been put on before I had the rear window installed along with the rear clips. So now that the rear window is installed I was wondering what my options are? How can I take these clips that are screwed in out so I can put the trim on and move forward? Im adding some pics to show what Im up against.
Below you can see I already have the clips screwed in and the rubber blocks me ability to get at the screw heads.
DSCN0904.JPG DSCN0905.JPG DSCN0906.JPG
Below you can see that the trim should have gone on before the clips and window. DSCN0907.JPG DSCN0908.JPG DSCN0909.JPG
The two pics above show the trim that I need to install.
I will be anxiously awaiting a secret how to get this in without having to remove the rear window! Help!!
Rod