AirPods work great on Android. Just make sure you have them configured how you want (like the touch and squeeze actions) because you can’t change them.
An alternative to AirDrop is LocalSend, but it has a massive asterisk: you must be on the same WiFi network. But I think you can start a hotspot on your phone and connect your other device to that and it should work.
Other than that, I’m not sure I’m qualified to answer for other stuff. In general I stick to cross platform apps and in general find continuity features more annoying than helpful.