May be a dumb answer but could you not just copy the content of a snippet in a document template? Yes I know that snippets are there for reusability but since Mendix keeps refusing to update document templates….
Regards,
Ronald
Have you tried https://www.notion.so/Templator-d35db3ba165346e3b243d6695636ccd4
It is specifically designed to generate PDFs from a Mendix page allowing you to reuse existing snipets etc