The Venn diagram of "not a programmer" and "can safely use Ed25519" is two non-overlapping circles.
I don't consider myself a programmer and I can use Ed25519 safely. I do however understand computing fairly well.
Simply combine this tool with `openssl enc` and your shell script is as secure as any shell script could be
"this app needs me to generate a key and point to it in config" is plenty of overlap