Would it be safer to have a will certifying that the property will go to a (hopefully trustworthy) Indonesian relative who will then help with the disposal or is it ok to have a will stating it goes to the WNA and they then have the 1 year to dispose of it as per other rules? Also what happens if no will is present?
You can not inherit it, as it is considered joint property (ie. you can't inherit something you already own). You can will it to someone else, but I think both you and the WNI spouse will have to sign, again because it is joint property.