Agreed, "as possible" is quite heavy, as is "everyone". But it at least slightly refines the question "what's right?" to "what's fair?". Which is still a huge question.

The quasi-literal answer to your question is: a voronoi diagram. It looks right - I don't quite know what it means in practice, though.

In general, the further a situation is from my baseline intuitions concerning fairness and respect for apparent volition, the weaker my moral apprehension of it is. Life is full of trade-offs of wildly varying importance and difficulty. I'd be suspicious of any short account of them.