Ah yes indeed the eventide stuff of course. Regarding recreation of sounds, I can't really help much with Etnica/Pleiadians. As that was never a style I explored, I was always much more into the sounds of AP, MFG, Miranda among others. For Pleiadians/Etnica, Filteria and Morphic Resonance would be your best options, as they did some research into that specific Italian Goa style. And perhaps E-Mantra as well? He was/is a member here too I think. Merr0w I think as well was inspired by that goa style to some extent? Don't know if he was active on this forum.
Too bad not many people participate here anymore, as there was a lot of knowledge with regards to goa trance production, among the producers who were members here.