The only problem with the blend method is that right now will only work if you have a hole made up of 2 edges, not if you have more.

But if you have only one single edge for a hole (like for example, the end of a cylinder or some tube-like surface that is made up of only one single surface instead of 2 halves), it is possible to break that edge into 2 edges by selecting it and using Edit/Trim with the "Add trim points" option.

Trim on an edge basically breaks it into smaller edge pieces.

- Michael