On Android (Calyxos at least) you can set up two profiles on the same phone. On one you can run Tor / Orbot. On the other an always on VPN.
Discussion
I'm looking to do this on the same profile. This reply seems promising though: https://damus.io/note1mn3s4er82aj7xlf5mxdj5t0f8qtttyjw95gj6tg0vqdlamrkxzysje6qkr