On Thu, 2020-07-09 at 13:32 -0400, Jack wrote: > I haven't done it, but would gimp work? It might be overkill, but > something about layers sounds appropriate.
Gimp can in fact do this, I just tested it. You'll need to mess with transparency perhaps, but as a proof-of-concept you can "paste as new layer" with a PDF page layer from another file.
