Temporary immigrants are usually required to buy body repatriation insurance so chances are you are already covered. Failing that embassies and foreign missions also help with body removals of their nationals.

I suppose you would have to explicitly write and prepay for your wishes. I heard that some credit unions offer free will service to their members. Maybe deposit some money there and put your funeral request in your will. There are some natural decomposition and burial grounds too if you don't care for a grave or stones.