I've looked into this a little bit more and it seems its not a very hard upgrade to marry a E39 Steptronic to the M60, then its just a case of finding a paddle/button equipped steering wheel setup which again can fairly easily be mated up.
I've not looked at all the details yet but there does seem to be a few that have done it.
I've a long way to go yet before I get to this stage though but still thinking about it
