If the right research funding is there, it might be worthwhile coming to the UK. Whilst none of the Blue Notes remain here (remember Moholo is back in SA, although he is over once a year - which happens to be at the moment, for about a month), there are a load of guys around who knew them and played with them - Evan, Harry Beckett, Lol Coxhill, Pete McPhail, Jason Yarde, Claude Deppa, Keith Tippett, Trevor Watts, etc. etc. etc.
Allen - could the group have been Dudu's 'Spear'? Dudu, Mongezi, Harry Miller, and Louis Moholo...Apparently, as you say, Dudu was a very nice guy - someone was saying he had a reputation as a serial 'sitter-in', and that it got a bit hard to turn him down, however appropriate/not he may have been to the situation..!
BTW - I like Ntshoko a lot on Scwheizer/Tchicai's 'Willi the Pig'.