Somehow I missed this book, as have I expect others. It was published in 2007, so thanks for the pointer via Twitter to Dr. Simon Anglim, of Kings War Studies recommendation:
Oman's Insurgencies by JE Peterson

The closest thing to an official history of the Sultan's Armed Forces of Oman, this book shows how insurgencies can be beaten and how a country
teetering on the edge of civil war can not only be pulled back from the brink, but put on the path to success and prosperity. The secret is political leadership honest and courageoous enough to address the real issues feeding an armed revolt not the ones it wants to address, and military leadership capable of applying the minimum necessary force in pursuit of this agenda.

This review points out he was the Omani forces official historian:

It is available in the UK in print and on Kindle:

In the USA:

Neither Amazon has any reviews.

Contents list: