With all the problems Ford should have designed a repair procedure and then paid at least half for the repairs.
Many people have posted that NAPA has a spark plug repair kit for Fords that is easy, not too expensive, and that works. Call your local NAPA and talk to them about it. If they will answer the phone of course.
Here is just one example of the many types out there so you can get an idea of how it works. Most people agree the Heli coil does not work well for spark plugs.