Leaking Windshield Gasket

Thanks, again to all who are helping.

I pulled of some of my windshield trim, and there are no clips in place. Trim was just glued on with sealant. It does not look like any sealant was applied to the gasket when it was installed. Do you think that holes could be drilled and trim clips installed with the windshield and gasket in place, or do I need to remove the windshield to perform that work. I found some trim clips on line (see photo). These appear different from the clips that I saw in 64dart170's resto thread - do you think that they will work?

Thanks again for your continued help.