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@gbj_tester
If you'd asked before wrecking it, we could have told you that the spline depth on those BBs is inadequate, even when you use the right tool. The interface was designed for steel components, and doesn't work for aluminium. If your threads are properly cut, the right cup should be easy to remove once you have the rest of the BB out, because it doesn't have a flange on the cup to resist unscrewing. That is a design flaw in the Miche BB which will come to your rescue now. Of course, if you didn't prepare the BB shell properly to start with, it might be tight, but it will be no loss to use a destructive technique on the BB cup since it was shit to start with and is completely fucked now. Cut some driving slots in it with a hacksaw and file and use a short piece of steel bar (about 30mm x 5mm will be about right) as a driver to get it out.