Need ideas to fix rattle in headliner

[RSW]

Need to draw on the wisdom of the community about a rattle in my FE2, V6 manual, sport suspension car. At lower speeds on a bumpy road, I have a rattle that seems to be in the headliner substrate at the top right corner area of the fixed glass in the rear cabin. It's on the driver's side. I had posted previously, when I thought the rattle was coming from the trim at the base of the fixed glass, but I've determined it's in the headliner just above the top right corner of the fixed glass. The headliner is noticeably a bit "looser" on the driver's side, where I'm hearing the rattle, than in the same spot on the passenger side. (I don't know if there might be some sort of "clip" mechanism in the headliner substate that might not be affixed on the driver's side, but is on the passenger side.) My friend riding along to help diagnose the rattle location only had to apply a small amount of finger pressure on the headliner spot to make it stop rattling. I'm just looking for ideas of how to possibly address it myself, and if I had to take it to a dealership (1.5 hours away), how badly would they tear up my car (sort of scared they'd create more problems/rattles than they'd fix). When I push on the headliner spot, it feels like there is something solid behind it (I don't know what is underneath the Alcantara fabric, whether the fabric is on some sort of headliner substrate which I'm able to push against something solid like the roof frame of the car itself, or what). One harebrained idea I had was to somehow punch a small hole through the Alcantara (and hopefully whatever is behind it holding the fabric itself), just big enough to perhaps insert a syringe containing some adhesive, and hopefully spread enough of the adhesive around to then push down on the spot for a bit and have it hold. The small hole should not be very noticeable, and perhaps I could touch it up. Any thoughts or suggestions? And, if I went to a dealership to fix it (and assuming they didn't like the injection of adhesive idea), how badly would they tear up my car in trying to fix it (e.g., have to pull back or remove the Alcantara fabric, etc.)? Thanks!