Here is a page of all of MIRI's publications, you can click Decision Theory and it will show all of the relevant papers. It might not be quite what you're looking for, but it might help with working out what MIRI are up to and what they have done in the area.

There might also be something in the rough workshop writeups.

If I were you, once I had exhausted online resources, I would consider contacting MIRI themselves (via email perhaps) if I had any more questions, they're definitely the people to ask.