I did already discuss it with him briefly and he didn't think it daft, but thought it would be best to just try it out (needless to say I haven't   ) Time, y'know.  But think I'll give it a go.  I was thinking some acoustic foam stuck to a speaker high board on feet, two of them.  Put them in place when listening and out of the way when not, thus getting over the whole WAF problem with acoustic treatment on walls.