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I'd just be worried about the weight. The reservoir is right at the back and 50%+ of the machine would be off the counter at that point. I think a solution from above similar to @mmccarthy suggestion is probably the safe bet.
@hippy yeah it won't be how I have it setup once we redo the kitchen but that could be 1-2yrs and so if I can get a something that works pretty well for that long and doesn't cost the earth then that seems best solution.
I'd be tempted to mount a sheet of wood onto drawer sliders on top of the worktop, so you can pull the setup out when you need to access the reservoir, and won't risk flooding that cupboard if you miss the spout, or having the water drip onto electrical items after the flood.
The more elegant version would be making that section of the worktop slide out, but that depends on the construction of the cabinets below, and what else is on the worktop out of shot.