Thanks for the feedback Doug. Looking at Gordon’s very useful pics I guess the front locknut and the p’clips still might be show stoppers for doing it from below.
Yes, you cannot avoid doing most of the work from above. I have since found that it would be possible to use one of those flexible spring loaded grabs (as from Proper Job shop). By inserting the head of the pin in the claws with the pin at right angles to the tool shaft, it should be easy.
