Question on door latch pin in quarter panel jamb, ‘72 ‘Cuda

I need to lower the door latch pin on my car to better align the closed door to the quarter panel.
Loosening the latch pin with a torx wrench, and sliding it downward to the limit of the hole in the jamb does not give me enough adjustment downward. The pin needs to go lower by perhaps 3/32”.

Questions:
Is the blind nut on the inside of the jamb retained by something?

If I were to completely unscrew the pin, would the blind nut drop down, causing me to take apart the rear seat interior...

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Author: Flat-Tappet