There was one set up at the York Rally, and it's wasn't all that much faff - just chopped fruit and a bit of juice or yoghurt in, lid on, pedal, bingo. Whatever machine you used, you'd have to prep the fruit a bit anyway.
It was a bit different, as it had the blender rigged to the front wheel which was lifted off the ground and set up to be chain driven. It meant the rider could see the smoothie in production, and added incentive to sprint.
