The shrink/swell of cedar with weather changes is going to be problematic with any adhesive. A scrap of hardiplank might be better.
That being said, 3m 4200 or West System Gflex could be considered.
Doing a ATF drain & fill in the "new to me" BMW 2002 X5 E53 (3.0) with 125k miles. The "lifetime fluid " is original from 24 years ago, however it shifts fine.
What fluid do you recommend instead of outdated DEX 3?
Yeah....
$20 endoscope to the rescue. I was able to repair without pulling the full headliner down. The connection to the rear sunroof drain was destroyed & the hose would not stretch further. Some 3/4 heat shrink should fix the problem long term.