Edited artwork (e.g. a cassette J-card made from CD cover art?)

With cassettes coming back (a little), people are looking for cassette CA they can print at home. Would it be permissible to upload an original creation of a J-card and cassette labels based off CD cover art, in cases where “real” cassette cover art doesn’t exist?

No, I don’t think that we should associate home made covers to real releases nor that we should create homemade compilations in MB.