I would advise against doing what you're trying to do, simply because you'll waste a lot of time.
Microsoft released drivers are released by, well... Microsoft. They integrate with the OS they produce. In ways that you do not want to mess with or work around: you'll most likely miss a reference: You'll set up Driver A that usually relies on Driver file X. If you forget to put that Driver file X at the correct location (because it's not documented, or you don't even know it exists), it will use the system one and have your tests fail, or it could simply crash.
Instead, I suggest you set up a workstation just for that, to test the "other set of drivers". The process is much more straight forward, is much more documented (hey you can do a system backup right after you set it up and restore it when you have more tests!), much less error prone, and will end up having you wasting much less time.