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Title may be confusing so let me clarify. I often use a simple tool called sops made by Mozilla that is used to encrypt/decrypt yaml/json/text files with your gpg key. It works from the command line so if you invoke sops on and encrypted file it will decrypt it, open the decrypted version on a temp file (located in /tmp/ on your $EDITOR and then re-encrypt everything and delete the temp file once you close the $EDITOR.
Probably a little more complicated than you had in mind, but there's a minor mode to open ansible's encrypted vaults which sounds as if it works very similar to sops.