I don't edit anymore, but as a reader, is there any reason not to conveniently put both on the same page at first, in different sections, both with a template, to indicate both are equally welcome and important? Sure, the podfic work shouldn't become subsumed under the original fanfic, like a mere appendix, but it's not like they don't have anything to do with each other either, and you could always separate and disambiguate, when the page gets too long and there is a ton of extra info on either the fanfic or the podfic, so one would overwhelm the other. I mean, fanart that was inspired by fanfic is almost always put on the same page as the fanfic, not with extra pages for every piece of art.