I would suspect they also do not want to commute to EDI. However, would there be any reason they couldn't bid onto the BA 767 fleet with the proviso that under bidline they had priority for the MAN-JFK. (A bit of lateral thinking by BA mainline reqiured - is that beyond them ?).
...er what about the other ex MAN people on the 757/767 fleet that have been commuting for years?
The secondees either go with the aircraft (I know two definately going to EDI) or bid off. If they happen to get the 767 and get a JFK occasionally fair enough.
Now if you are talking about eastablishing a 767 MAN base (now I wonder if anyone has thought of that before..Oh yes I forgot they closed it) then you are talking.
However many of the secondees would be killed in the crush and not get anywhere near it.