Sounds like a fantastic idea, there's plenty of dodgy garages around that will fail for work, or fail to stay within the national average (So i've been told by a particular MOT tester I wouldn't use again).
Then again, it opens a new business opportunity doesn't it, a 'pre MOT' that would avoid the issue of points / fine and discover those issues prematurely (hours before an actual MOT, thus making the vehicle no safer for the other 11months). Easy 1 hours labour charge.
In case it wasn't obvious I disagree with the idea, and think it's a rather daft idea. Though I do agree that there are countless unroadworthy vehicles on the road, that aren't being fixed. Especially this time of year, lights being obviously, and blindingly out of alignment being one.