@doctormo I like the idea a lot. I have had good experiences with preparing a SVG with placeholder text, which gets replaced with final texts (e.g. using sed) and then using Inkscape to export to PDF. Providing ample space or some mechanism to limit user-provided input would be important I think.

The only potential issue I see is that if not done well, such flyers could also get annoying, if not done well or overdone. But I think Fediverse has not yet reached that point. :)