I like this setup:
- An unmodified iPhone SE (2022 model) with OS support until 2032. This runs all my authentication, banking, health, etc. It is in airplane mode 99% of the time unless I need it.
- The second is a Pixel 9a with Graphene OS for daily use, routing and internet access.
This is expensive, but I found it to be the only viable solution to this problem.
Well, I use older versions, but I think two phones is the best approach.