Hej hej,
I'm in the same boat currently doing the same transition so perhaps someone with more experience should answer... But if you can stand an answer from one of those forbandede svenskere, here goes nothing.
I'm guessing MittID is similar to Swedish BankID used for all kinds of authentication, like for banks and taxes n stuff.
Currently BankID does not have a GitHub or similar release page so obtainium is out. I want to minimize the use of Google play as much as possible which leads me to install this via the Aurora store. So thats what I would try if I where you.
If I want to install an app I try these methods In order:
- Graphene is native app store (basically nothing here)
- Accrescent (up and coming but not much here either)
- Obtanium (find the GitHub page and add it in this app. Risky if the developers GitHub account is compromised... Less oversight than the stores but who knows how thoroughly they look through the apps)
- Aurora store. (Mirror of Google without needing a Google account. Gets a bit of flack from security people but what are you supposed to do when this is the only non-google way the app is made available?)
- Aurora store in a private space... puke with Google services installed. (The apps that ended up here are those dependent on Google Maps integration, Bolt Uber and the likes. Would be keen to here if there is another way to do these apps without Google maps)
Good luck on your journey!