Now that I have sourced a flash chip AND a rom image for my 6000, I am going ahead with purchase of the CML modules from segor.de as I also have gotten access to a surface mount soldering kit.
When I last contacted them back in October last year, sales@segor.de, they wanted 39 euros per device including German sales tax @16%, 7 euros for regular postage.
I am going to buy TWO of these, so I'll have one "spare" to sell on or fit to another 6000 if someone is willing to travel to Cambridge (assuming, too, that it all works) - so contact me soon if interested.
Given that the cost of postage isn't a killer, others can always buy their own.
I will add followup when I know the current price!