i know Rethink only has Wireguard and Orbot in the settings
With Rethink DNS yes.
Proton VPN: Sign-in If you log in here, there’s a section called “Downloads” in the left-hand panel. Go down to the Wireguard section then choose your country. Click create, and you have a choice between a text file you can download or a QR code.
Open RethinkDNS, click on “Configure” on the bottom, then “Proxy”, then “Setup WireGuard”. Click the plus sign and import either the text file or snap a picture of the QR code (I find taking a picture of the QR code works perfectly). This should then connect RethinkDNS with ProtonVPN.
But also I’m not sure about Android 12, for me this works with Android 14 and 15.
There is an option to download a .conf file, and you can upload that through the RethinkDNS app. I just find it faster to take a picture of the QR code versus downloading a .conf file and then uploading it.