Agrarian Law Of 1960 states that only Indonesian citizen can OWN land. That will NEVER change, no mater what anyone will tell you.
So how do you move forward? 25 year lease legal, Hak Tanggungan (mortgage) legal, PMA company Lease legal, Nominee lease, you don't own anything just have agreements with legal owner some documents legal some illegal. Depends on how much money you are willing to lose if things go wrong.
Thanks Fred. Yes the agrarian law and land ownership law operate in the same way as in Thailand, Vietnam and various other places. Will likely explore the PMA route.