I still don’t believe that the issue is debris. If debris was the problem they wouldn’t need to replace the keyboards. They could just clean them.
I’ve used multiple cans of compressed air on my 2016, and nothing has helped my malfunctioning B key.
I have once mentioned that heat changes how the keyboard behaves. And someone commented that his MBP was most of the time in clam shell mode and his keyboard acted up. If debris are just part of the problem and there is something else, it might have something to do with the plastic? I really wonder.