Despite my best efforts I can’t seem to find the article or post now, but I have definitely come across someone in the old subreddit that did basically what you’re describing. They stripped an air tag down to bare minimum and hot glued it internally. They tried to use the decks internal battery for power, but it was throwing off battery draw enough to noticably impact the performance. I think they ultimately added a auxiliary button cell battery to power it, there was enough room in the case for this so it was still all internal.