Then you must have magic fingers. I don't know how you'd get the weatherstrip in place with the glass still engaged with the tracks. The window will still be in the track even in the lowest position.

Even if you can, it would probably be quicker & more easier to remove the glass since it's literally a matter of 2 bolts, tilt & slide out.

Of course, if your windows are tinted, you have to be much more careful on the 'slide out' part.