I agree on CLI text editors. I get why they exist, but for most users they should be a last resort, not the primary instruction.
Instead of telling people to use Nano, just tell people to edit the .conf in a text editor and let them choose!
Many users won’t understand that what they’re being told to do with Nano is literally just edit a text document with a funky file extension, and that they don’t actually have to that it in CLI (in-fact it might even be easier not to if you’re not familiar with them).
Not to be facious, but in simply asking this question you’re already beyond the scope of the people most GUI tools are designed for (I.e. novices who either don’t need this tool often enough to learn the CLI, or don’t need the advanced features you’d get from doing so).