Thanks and thanks for the suggestion.
Just judging, for now, from Wikipedia’s summary of the book, Kingsley's view of the mystical Presocratics is reminiscent of Heidegger's. But the kind of pantheism he finds in Parmenides and Empedocles contrasts with some insights I find in Schopenhauer and the Eastern traditions.
This looks like the big question for mystics, whether the oneness is something to approve of or to be horrified by. Should we surrender to the underlying, metaphysical dynamics or attempt tragically to break free with the promethean ("satanic") path of technological progress? Human history looks to me like it's firmly on the latter path, so the question is whether the Anthropocene, civilization, and all our escapes into artificiality should be condemned as blasphemous or interpreted as secular forms of Eastern escape from natural oneness (moksha). Secularism, seen aright, is already mystical. I should write something directly on this question.