While you're trying to do this, look into CLEP tests. They do what you're looking for, but in many topics, not just CS. Want to test out of your humanities requirements? CLEP tests let you do so (at least for many universities).
Also talk to professors about independent study courses, you may be able to knock out extra course requirements in summer terms where they don't normally offer courses, keeping the calendar (but not semester) time lower.
It's both about the cost --which isn't trivial-- and the time. Most of our degrees have at least a year of stuff no employer has any interest in paying for. Education being the racket it is, there is no way to challenge it. This quickly points you in the direction of non-US universities, where this nonsense does not exist.