Donald Qualls (he's here on apug) came up with a monobath formulation using HC-110, and Ilford Rapid fixer, and household ammonia. He originally posted it on photo.net, and I referenced it in an 'pintoid' camera article here on apug in the how to article section.

It works. My negatives were printable, but a bit low in contrast. I plan to experiment with the developer as a winter darkroom project to see if it can be optimized. I don't know if he has any refinements to it.