Instax on Hasselblad, RB etc ??

Not so far. And it might be difficult to adapt. Back in the days, all Polaroid medium and large format holders were for peel-apart pack film - integral film is exposed from the back, and needs a mirror between lens and film, so it requires a camera constructed for its use.

Given that there soon will only be integral film (at least until somebody starts a new peel-apart production more or less from scratch), I'd be surprised if nobody started to work on adapters - but these would require offset optics.
 
An adapted back would result in mirror reversed images. And it could be difficult to position the film in the focal plane - the Instax films aren't big enough to fit the frame of the pack around the camera (as in peel-apart backs), nor are they small enough to fit inside the film gate. It might be too close a fit on the Hasselblad or any of the 6x45 reflexes, but I suppose it could be done on the RB67, if you remove the rotating frame (like the pack film holders did).
 
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