Can I change the firebase project in runtime?

[alex-chaplianka-dreamed]

Our app need to be able to support different push notifications channel hosted on different firebase projects.
The firebase project's are used for sending push notifications.
The firebase project is decided after the user is logged on.

I suspect it's impossible, but I'm making a stretch to see if I didn't think of something.

1. getMessaging() only supports one app.
2. DEFAULT app can only be initialized once.
3. DEFAULT app can't be deleted.

So logging in to project X, and then logging to firebase project Y. is impossible.

If it is impossible. I wonder why it's designed this way. No one ever needed support for different firebase projects in FCM?
Can I somehow still keep the token lists separate? Such that my service account X, can't reach the tokens in other environment?