Verdict: not only does it work, it rocks!
It's probably the best thing since sliced bread, the combination of these two hacks, lol.
Now it allows you to be logged on as an admin in the ACP while simultaneously you change between all measure of different test accounts to see your changes.
Nexialys' hack giving the ACP a seperate session means you won't be logged out of the ACP while you switch around in the forum.