zjw there are funerals just like what you described and I know someone who's relative had one- a "green" burial and they were buried by a tree or something not a graveyard and headstone or such. As for buzzards I think I read awhile back that some buddhists will set their deceased on a mountainside somewhere for that was well, look up "sky burial".
I have always marched to my own beat, I guess in this way I have always lived "authentically". True to the nature of doing so, some are highly offended by this and would try and stop it. The few who actually get it are thank goodness quite good company.