I don’t have a key yet (which is why I’m asking) and I definitely want it in combination with passwords (they can take the key using force; but they can’t take thoughts out of my head just yet).
As for android apps not working with the yubikey: try giving KeePassDX a shot; I got it from F-Droid and it does give me a hardware key field with the option to autofill with “Yubikey challenge-response”.
Let’s *NOT* go that route.
I’m very much looking for a hardware key to avoid biometrics (I can have a field day expressing my opinions on those; but in general they tend to be the weakest MFA factor and most have known working bypasses based on photos).
This leans a little too close to that for me to consider, let alone all of the things you have to consider when putting implants in your body.