>An unmodified iPhone SE (2022 model) with OS support until 2032
What makes you think it'll be supported for a decade? Looking at the past models, the support period is around 5-7 years. If you count security updates that might get you to 10 years, but at the 7-9 year mark apps will eventually refuse to update because you're not on the latest ios.
To be fair my 2016 iPad Pro is up to date and can still run any app I throw at it
If you’re not using it regularly, why would you need anything except security updates?
By the time that iPhone SE 3 finally goes unsupported (even the iPhone SE 2 from 2020 has yet to lose support) you'll just buy a cheap refurbished iPhone 16e. Old-gen iPhones are widely available and quite cheap.