However, after years of using a small changing bag – usually with great success – I bought a Calumet Changing Room which is a fancier (roomier) version of a changing bag which allows your arms and hands to work much more freely and is the business.
That looks like a similar set up to the one Joseph (JB7) was using on the Mourne trip for working on his Large format negs. Except his looked more like a mini tent.
Years ago I used to love watching the tv show Lost in Space, aaahhh, happy memories. When I followed your link I could hear this voice in my head going “Danger, danger, Will Robinson, danger, danger”. Probably before your time and this reminiscing is lost on you.
I used to have terrible problems doing this using a changing bag. After doing one or two rolls the moisture builds up in the bag (from sweat etc) and the film starts jamming on the reels. I don’t use the bags anymore and just do it on a desk in the darkroom and it’s a million times easier.