Good points. I’d give your post a thumbs up, if I could.
It’s easier to identify pre-1975 books Franz wrote: Babylon The Great Has Fallen! is a good example.
Post 1975 I suspect he wrote, or helped write the Trinity brochure and the Divine Name brochure. But I don’t know what apart from that. I think he became blind in the 1980s so that may have curtailed his writing too. The Survival book is in the mould of Franz with all the typologies but I think that is credited to someone else (forget who) that probably followed in Franz’s footsteps theologically.