JR Pass 14 Day or Regional Pass

Hello! I am an old lady traveller who loves Japan and I have been to Japan twice before and used the JR Pass without any problem. I am about to purchase another pass but I am not sure whether to purchase regional passes because I am visiting Kyushu and Shikoku and work my way down to Tokyo.

Here is my proposed schedule:
Day 1: arrive Fukuoka, Kyushu
Day 2-3 Kyushu, Fukuoka and Nagasaki visit
Day 4 travel towards Shikoku and stop by on the way, maybe Okayama
Day 5 To Matsuyama, Shikoku in evening
Day 6 travel to Kochi in evening to meet Japanese friends
Day 7-8 Kochi
Day 9 travel towards Fuji in evening.
Day 10 Fuji area
Day 11-14 Tokyo area

Thank you for any advice or help. I already looked at hyperdia and I was overwhelmed by the data it provided, including the extra charges for use of non-JR passes in between journeys. Therefore, should I buy regional passes or 14 day JR Pass covering all islands. Would the extra charges make the 14 day Pass more expensive?

June