As far as I know very few airlines have approval to run reduced conversion courses in europe at the moment (I think this is what you are refering to). The equivalent Boeing-Boeing shortened transition course (STAR) is the boeing version of CCQ. Which you`re probably aware of.
In order for an operator to run the Boeing STAR course they must have AQP approval (Advanced Qualification Programme). Most major airlines in the USA have this stamp from the FAA. The closest we have to AQP in europe is a new JAR reg that has come in allowing operators to excercise ATQP schemes (Alternative Training Qualification Programme). I spent some time investigating this for BA.
Till ATQP is implemented in the European airlines I don`t think we will be permitted to run CCQ/STAR type courses. Though this is not the primary reason for implementing ATQP.
Incidentally we investigated the content of the Boeing STAR course and found that the content was reduced in areas we would not consider reducing training. For example 767-777 training was reduced in areas such as RTOs and EFATOs because of similarity. Using ATQP principles we should not be cutting down on these items, but INCREASING the amount of training on them in favour of reduced cockpit set-up/other mundane drills in the sim. Thus making the sim time more productive.
I doubt BA will ever endorse CCQ (or STAR) for these reasons, however I do think it would be in their interest to seek ATQP approval.
Hope that helps.