I'm always willing to learn, but I didn't think you could apply an MSG3 based maintenance program to an MSG 2 designed aircraft. My understanding was that an MSG 3 aircraft was analyzed for structural and reliability capability in relational to failure modes and their effect on continued safe operation.
An MSG 2 aircraft with components and structures built around hard times and condition monitoring etc rather than reliability driven maintenance and inspection models, could be inadequately inspected because many of the components and structures were not designed for the MSG 3 style of capability maintenance.
If there was some way to do it, I'd be amazed if you could accomplish it via a lower level check like B check. I'd have thought a C or even a D plus SSID and AD's etc would have been more the order of business.
I'm betting there's a maintenance program PPruner somewhere out there with the answer....