I would try this, maybe in a macro:

First cut out the hole like you did

> ___      __
>    |    |
>    |    |
>    |____|

Then cut out a hole not so deep but with a bigger radius

  __          __
    |_      _|
      |    |
      |____|

The last thing is placing a torus that way, that it fills the edges. The 
major radius for the torus is the radius for the bigger hole and the 
minor radius is the radius for the first hole you made.

___ _      _ ___
  | |_\    /_| |
  \___|    |___/<-- this is the torus
      |____|


I hope this is clear enough.

I also could post some code if you wish...

So long,

Bonsai

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