Yes, hardly seems worthwhile removing and replacing the windshield just to replace a gasket with such minor (cosmetic) damage. I would get a small tube of black RTV silicone sealer. Carefully mask triple thick the "line" originally created by the gasket. Squeeze a small amount of the black silicone into the void. Smooth out with your index finger ONCE as screwing with it will only make a mess. Let it cure over night, then carefully remove the tape after dressing the edge with a new single edge razor blade to prevent the tape from pulling out the patch. I doubt anyone but you will ever notice the fix. If you are not too good with things like this, a glass shop could do it for you at a small cost I would guess.
If the look bothers you AFTER you try this, then I would go for the windshield R&R and a new gasket, however even though this can be done without removing the front fenders (as Ford recommends) it is still a major job and there's always the chance something else gets damaged during the process.
Good luck. usmcfred