nostr:npub1rj3ep4vg936dqmcjcvdrkkf8fzupvmtl7hhc2sqqt29l05fq602qf9y9re From experience, I can assure you that doing this would create *hundreds* of hours of support requests for me from users who like the sound of MB4 but then can't figure it out. It's *very* easy to convert the MP3s at your end with free utilities like m4b-tool.