Disclaimer: I do know of the Machon Shilo Siddur Eretz Yisrael, although according to folks I know who have studied the issue, it is not a true nusach e"y siddur.
Is there a complete siddur with the text according to Nusach Eretz Yisrael available, other than the above mentioned Machon Shilo version, either online or in print?