I'm in the process of doing something similar but just planning on throwing them on my Immich instance once they're ready (and that lets me share them with other people as well with the Immich account management).
I was under the impression that Ubuntu Touch worked just fine with the Fairphone 5 which is very much not a "7-year-old out-of-production device". I'm currently writing this from a Fairphone 4 (with CalyxOS, not Ubuntu Touch though).
I have quite a decent collection of these and only cancelled my subscription about a year ago. I just didn't read them as much as I once did and couldn't justify the cost. I did love them when I did read them though.
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