An update in the matter, for those of you still keeping up:
I wrote to Charles Cecil yesterday after seeing this tweet:
http://twitter.com/CharlesCecil/status/249904145870516224 -- and apologized for what was a knee-jerk reaction to something precious to me seemingly being exploited for cynical gains.
It seemed fairly obvious, from the tweet and his subsequent e-mail reply, that he would very much like to reconnect with Dave Cummins and have his input on Steel Sky 2, if it were possible to track him down. Dave Gibbons, the artist on Steel Sky 1, is already interested in moving forward, and Cecil's mail made it clear that they wish to stay very faithful to the tone and style of the original game. Having Cummins on board in some capacity or other would surely ensure that.
Trouble is, Cecil has no idea where Cummins is, either. It's like he's disappeared off the planet. I did a little search yesterday, and there is a Dave Cummins living in Kingston-Upon-Hull (where Revolution were based at the time of BASS), but I doubt very much it's the same guy -- and there was no e-mail or address along with the name. I even tried e-mailing a few people on Soundcloud named Dave Cummins, knowing that Cummins was a musician on BASS and probably still dabbled in music, but no one has replied (and that was really a long-shot, anyway).
Speaking of long-shots, I wrote what may be the longest shot in the history of the world -- an open letter to Cummins:
http://pleimert.tumblr.com/post/32340489961/whereisdavecummins
So, to sum up: Charles Cecil would really like to work with Dave Cummins on Steel Sky 2. Barring that, Charles just wants to reconnect with him. Barring THAT, Charles just wants to know if the dude's still alive somewhere -- even if Dave doesn't want to talk to him.