Just so you know Apple has a free repair program to fix any keyboard issues with the new butterfly keyboards [https://www.macrumors.com/how-to/get-free-repair-macbook-pro-keyboard-from-apple/|How to Get a MacBook or MacBook Pro Keyboard Repaired Free Under Apple's Service Program]
I’m not sure what glue Apple is using as the plastic is polyester which is hard to glue. Tesa tape might work [product|IF317-072]