Maybe for something important like account access, keep things open-source and use FreeOTP as a drop-in replacement. It's on F-Droid here: https://f-droid.org/repository/browse/?fdid=org.fedorahosted...
Admittedly this is not perfect, but I am comfortable with the level of security it provides. I think it is also roughly comparable to users who have a 2FA app on their mobile and a password manager syncing to the same device.