This situation has happened in the UK and aircraft that have no manufacturers support are transferred to permit to fly. No problem really unless you wish to operate commercially.
As for legality in europe EASA is a legal entity and its rulings are European law.
I understand that the current UK light aircraft maintenance program is being replaced so the wording of the new document will be interesting.
The CAA began a consultative process on 6 feb 2012 lasting six weeks
A taste would be
"industry feedback revealed that the use of manufacturers instructions was something to be promoted"
So I think you can read between the lines a little there.
You can see the new format on the CAA website and basically the threat re c of a invalidation as described in my post above remains.
The main change to LAMPS is this new program mandates the use of the manufacturers
maintenance program with additions.
So back to our Cessna issue you will need to comply with the structural inspections.
I suspect that realistically as Part M are required to evaluate all new documentation and time is allowed for them to do this the inspections will hit home in the early part of next year. I suggest that this will align with the next annual.