No, I hold several of the licences that you list there. I have tried to make a clear distinction between what I see as 2 separate arguments:
1. The licencing standards; and
2. Disparity in treatment between people trying to obtain a particular licence
Yes, JAA should have a bridging exam, and I am sure that eventually there will be one. But expect it to be very large to cover the huge differences in syllabus requirements. Will that change much in reality? Surely just jumping through the same hoops but under a different title.
If the JAA felt that your flying ability was substandard then they would require you to undertake more flying training, which isn't generally the case.