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It is. But the clearance between the headset cup and the steerer tube is a bit marginal if you're trying to squeeze a hydraulic brake hose down there. Also, you'd face the problem that AFAIK no-one makes EC44 top headset units designed for a 28.6mm steerer, so you'd end up with a rather fugly top cap arrangement.
Brommers
Jaap
I think an EC44 bearing is the same size as a ZS52. Providing the bearing itself comes out of the cup (unlike CK), it may be possible to use EC44 top and bottom with the top one using the internals of one of these internal routing ones