John, Polaroid Instant Film is a good example of a surviving monobath system (it is a viscous monobath).

With regard to archival characteristics of a negative processed in a monobath, Polaroid 55PN and its smaller counterpart require additional processing of the negative to achieve archival properties. I have been post processing and storing microphotographs as 55PN negatives for years (it appears pretty much identical to Kodak Panatomic X).

I know I have a number of monobath recipes in my collection of Dignan's Notes (I have a whole file cabinet drawer full of Patrick Dignan's notes). I'll take a look and let you know.

By the way, I am skeptical about the "lack of silver" thing. I don't know of any causal connections between abundance of silver (or lack thereof) and reticulation.