I own a podcast network, and I'd switch all of our shows to you overnight if you add customization to audiograms.
I think the basic features of audiogram customization that would be be most valuable would be (using your first all white template as reference):
-replace background image
-ability to have the subtitles aligned not only in the middle as they are now, but also on the top or the bottom third of the square.
-subtitle line of text (between 'comp title' and speaker) for podcast show name, then episode name
-basic color palette for before and after colors
-subtitle line of text (between 'comp title' and speaker) for podcast show name, then episode name
-font
headliner is a poorly designed program riddled with UX issues and buggy software, and they butcher the uploaded subtitles from descript if you try to use 'karaoke' mode. At this point, headliner is such a pain in the ass that I'm having a quicker workflow by publishing your audiogram using a white template, downloading it, creating a Premiere project, removing the white background, repositioning the text, and using effects to modify your color scheme.