Delegation by modifying __class__

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In O'Reilly's book, Python Cookbook (4th edition?), there is an article by Dave Beazley that implements a state machine using delegation. The technique described modifies __class__ of the various state objects. This works fine in CPython but does not work in uPython. The article does state

Object-oriented purists might be offended by the idea of simply changing the instance __class__ attribute. However, it’s technically allowed. Also, it might result in slightly faster code since all of the methods on the connection no longer involve an extra delegation step.

Will this uPy behavior remain or will modification of __class__ be implemented at some point?