No, sorry Chilli, I'm not agreeing with that.
You seem to be agreeing with the AIP that IMC-rated pilots should add 200 ft to the obstacle clearance that they get from the standard approach minima. Presumably, this is because they aren't very good and holding their altitude while doing other stuff associated with the approach. OK.
But now we come to the manoeuvre that is probably the toughest thing we do in instrument flying, a feature that many pilots have found out the hard way, sometimes literally. It's sufficiently tough that many airlines ban it, or impose minima way above the statutory minima. It's an instrument/visual transition, with some fairly abrupt turns, at low level, in potentially windy conditions (where was that downwind turn thread?), with a crappy horizon, and instead of having a nice set of lights to aim at, we turn away from the lights. I'm almost tempted to say that if you haven't frightened yourself in a circling approach, you need to go and do some in nastier weather.
But for this suddenly the altitude holding gets easier, and the IMC-rated pilot needs only the same buffer as the instrument-rated one? I beg to differ.