From my dealings with the CAA, no matter the extent of the experience that you may have, experience earned from working on N registered aircraft will not count towards the issue of a Part 66 AML. One such inspector told me that it at the end of it all, it does not fulfil the requirements of EASA.
However I have spoken to other licenced guys whose MRO's maintain American carriers and they have not had an issue with the CAA accepting N registered worksheets. I guess the level playing field is not so level!
I obtained all of the B2 modules but the CAA will not recognise the experience I have gained purely because of the letter on the tail.
I agree with Flightmech, the A&P system is regularly knocked by most. For me, it will do just fine!