A and C: I've gone through the SIDs for my TR182 and a first estimate is between 6,000-8,000 €.
What I don't know is how much it costs to remove the engine and accessories to inspect the engine mount. The SID states:
This is a complex and involved inspection. It is recommended that the inspection be coordinated with an engine overhaul, even if the time does not exactly agree with inspection hours. Recurring inspections will be satisfied by inspections at engine overhaul. The initial inspection must be completed by June 30, 2015.
How much effort is that? A day? More than that?