Dave. If you await my experiment you may be playing the harp or stoking before you get the results! I certainly second the idea of some stalwart such as Leon giving it a go. It's the prints that are the clincher either way.It's precisely that sort of article that would make me buy B&W mag. I do now most months anyway but I give a committment here and now to buy B&W mag when this article is there.
Just one further thought. It may be that Peter Hogan did the experiment himself and has the evidence and could cobble together an article for B&W.
Everything I hear about him suggests that he recommends his alkaline fixer for sound reasons but it would be nice to see an article on it.