To Benv - I take both wheels out of my mountain bike to put it in my car to travel to where I ride. On average I ride twice a week as a minimum. Rough maths suggests I've put the wheels into and out of my bike in the region of 600 times over the last 3 years. I could count on one hand the number of times my pads have moved. I'd give hydraulic brakes on your mountain bike another shot if I were you - you were either unlucky or something was wrong.

To the OP - However, as someone else pointed out above, if you are changing to a different set of wheels pads will almost always rub unless you happen to get very lucky. As a result getting a spare wheel from neutral service is likely to be something of a gamble.