It is a clear case of derivative work (see also https://commons.wikimedia.org/wiki/Commons:Derivative_works https://commons.wikimedia.org/wiki/Commons:Derivativ

It is a clear case of derivative work (see also https://commons.wikimedia.org/wiki/Commons:Derivative_works https://commons.wikimedia.org/wiki/Commons:Derivative_works - internal docs, but their explanation of copyright status tends to be well done) This specific one would not be a problem, but doing it with a still copyrighted work would be.