Here's one additional thought: try and push in on the door from the outside when you are working the door lever. Or perhaps trying to lift up on the door. Maybe even a gentle but forceful "rap" on the outside or inside of the door.
Without having the door open, I don't know how you're going to get the inside of the door off without trashing it.
Maybe take it to a body shop instead/as well. They may have some ideas.
Good luck. I've never heard of this happening on any car.
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