Mapping Magic Zoom to the half-shutter button on 5dMKIII

[woody084]

Is it technically possible to have Magic Zoom triggered by the half-shutter press as it was on the MKII? At the moment its possible via a few methods including the Magnify button, but this is very inconveniently positioned. I use the half-shutter method on the 5DII constantly and its awesome for live event work.

Is there any possibility this could be made possible on the MKIII also or is it technically not possible?