All I know is, when I replaced all my bulbs with LEDs, including the glove box, IT WAS A NIGHTMARE to get it installed.
For something so simple, I was sweating and about to rip the whole thing out. LOL
So, all that said, I feel your pain...
Not sure of the answer to your question.
However, I was close to purchasing covers once. But, I often worried about the excess heat it would have to deal with. Maybe spray painting (in a kiln and such), might be a better alternative.
Are you sure it is not just the passenger seatbelt, 'tapping' on the B pillar?
I almost brought my car in because of the noise I was having. Then, I noticed said noise never happened when my Missus was in the car. That got me thinking, and I figured it out...