A nice book called EARTH IS THE AIM by Douglas Moonstone delves in to the history of the survivors from a completely different prospective, they are called The Tocharian in his books.
Although the information collected if very large and quite amazing you will face difficuties navigating through it, but it is well worth not to give up, you can start on this page https://earthistheaim2.wordpress.com/2016/01/19/earth-is-the-aim-6-exoduses-and-survivors-part-2-peoples-of-the-sea-chapter-7-the-sardinian/ and something like table of contents could be found if you scroll down, where it says "Links to chapters".
this one will keep you busy by the time this website is ready!
lovely historic images!
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