Constitutional monarchy is a pain to get to from an absolute monarchy. You have to go via a republic and have another revolution -this time of the middle class.
Allow a minimum 4 turns for each revolution, that's 8 turns where you are pretty much unable to do anything internationaly.
plus, as I mentioned above, a republic has lower discontent and a +ve bonus to tech research.
I wouldn't pull off the Absolute-republic-constitutional move untill you are safe and your empire is stable and pre-eminant, which is ironicaly when you probably least need a revolution...
Shame though as constitutional clearly is the best of both worlds and most stable long & short term.
Another reason why GB have an advantage...
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