the non-recursive part of this image is mildlyinfuriating

Have you tried https://mike-fabian.github.io/ibus-typing-booster/ ?

I have not, but I think it does what you’re looking for.

The demo video emphasizes its use as an emoji picker but it was originally created for typing Indic languages.

I wonder how much work is entailed in transforming Fedora in to a distro that meets some definition of the word “Sovereign” 🤔

Personally I wouldn’t want to make a project like this be dependent on the whims of a US defense contractor like RedHat/IBM, especially after what happened with CentOS.