Best Solution for Bluetooth Tracking?

Ive been recently considering a Bluetooth tracker to ensure I don't lose my keys. I just want something I can put on a keychain where if the tracker leaves Bluetooth range of my phone, my phone will buzz. The problem is this field is very much not privacy focused, so Ive been trying to find the best solution I can. Ive extensively scoured older threads on this subreddit and others and my main solutions right now appear to be:

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