I see no easy/convincing way of doing so right now. I'll write up my ideas when/if they sufficiently mature, or, as is often the case, I'll move on to a different line of investigation. Basically, morality is seen through a collection of many diverse heuristics, and while a few well-understood heuristics can form the backbone of a tool for boosting the power of an agent, they won't have foundational significance, and so selection of the heuristics that need to be explicitly understood should be based on the leverage they give, even where they are allowed to have some blind spots.