I'm afraid the 9000 would be beyond Thoms means, I've got an 8000 given to me back in the day (!). The scans are pretty good with the glassless carriers, but the glass carrier keeps the film really flat and is much better, really significant. The disadvantages of 2 glass layers are outwayed by the increase in resolution with a perfectly flat neg.
I use Dougs 120 film holder with antinewton glass for the same effect on 612 and 617.
I read this this thread last night, and I dreamt of you Thom. You bought me some fish and chips, not sure what Freud would say about that?