In my opinion the reason this is a problem has nothing to do with bike being a Harley or costing $18,000.00. It all has to do with the lack of empathy from the servicing dealer. And when you purchased bike, you purchased the extended warrty based on having all points covered should you run into a problem. Because of the way your situation is being handled it just adds insult to injury.
So my suggestion would be to try another dealer and get a second opinion.