If there is a lot of flesh left I would find someone wit a colony of flesh eating beetles. They really do a great job at cleaning up a skeleton. I have a friend with some that would let you put the turtle in but its a pretty good drive for you.

Careful with the boiling. if you boil it too much the plates on the back of the shell will come off.

your best bet is to find a red ant hill and stake it near that. It needs to be red ants not those pesky fire ants that have invaded over the last decade.