This is just a project idea for someone else to grab, I’m not going to work on it.
Did you know that the Linux kernel has a gtk2 app to configure the build? With the make gconfig command, documented in the admin-guide and with its source code located in scripts/kconfig/.
This would be an opportunity to port to GTK 4 and possibly Rust.
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In general, I think that sharing such project ideas is a good thing. Maintainers like me are already busy with their project(s), but external contributors could find an interesting task to do among a list (if such a list is created).