How does ADD RESOURCE work for Header (and footer)?
I now paste the header with every change again in every page, probably could be easier.

When one has put a .css or .js file in the Project Resources, The Head or Footer 'Add Resource' in Settings adds the necessary <link rel="stylesheet" href="./xxxx.css"> or <script src="./xxxx.js"></script>.regarding that .css or .js file

Frank