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.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.