Yes, the late Marty Forscher did it on a friend´s M3. Will probably run you $150.
Personally I don´t recommend it it's the weakest link in any M4-2, M6, M7, ... camera.
I use an inexpensive adapter on my M3 (earlier on an M2). It slides into the (cold) accessory shoe and provides a hot shot at the top with a sync lead.
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