I think you could use any cabinet, just take the door off its hinges and put the Hafele mechanism instead. It should not be beyond the skill of the fitter to undo a few screws and drill a few holes. They used to get fitted on TV and hifi cabinets when TVs were huge and it was the thing to put them in a cupboard.
You could try an independent kitchen showroom as they can order in anything they want and aren't tied to the Wickes standard range or whatever.
I think the door goes inside the standard unit. You might be restricted with shelves/fittings, or have to fit another inside "wall" to hang the shelves on like this. It's just chipboard, you can order extra matching panels to chop up for things like this. It's more about whether the kitchen company and their fitter will source the parts and build it for you as a bespoke item - it won't be in the standard range.
Thinking about it my friend had a thing like this - the door flipped up to the top of the unit for a cabinet with her microwave inside.
Thanks Raising. Leicht offer it as standard on some of their ranges (you can hide ovens etc in extra wide cabinets) but I can't find anyone else who does. I don't mind the idea of "winging" it for one or two cabinets but for a whole line, including appliances, I thought it might be safer to go with a designed one.