I think the concern that the written fanfic is seen as "the root" in an hierarchical way, even if the derivative podfic is way more noticeable is real, and may happen in editing as many things may in collaborative wiki editing when not everybody has read over every guideline and convention. But I also think that the way to counter that should be having a gardener guideline how to fix the issue (for example with my two template idea, or by splitting the page and making two if both are long), not a notice on every page for this potential problem that enforces that podfic pages must remain separate, and prevents potential editors from adding some fanfic info to the podfic page without the need to create a whole new page.