After some time working on it I was able to put together an #AppImage following my proposal to a new format version (type 3).
It's a gnome-calculator build contained in a single file that doesn't break the ELF specification and has a much more flexible way of storing the update information and signatures.
For more details about my specification proposal, please check: https://notes.azubieta.net/s/BkdOKxgsd
As always, comments and contributions are welcome!
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