Yeah, I was trying the same thing before writing the post, hence why I was very skeptical. Not that I wasn't skeptical to begin with, but I'll happily be proven wrong.

Oh, the results? No cooldown reductions whatsoever with Presence of Mind active. Divine Seal was still 60 seconds, Swiftcast was still 60 seconds, Surecast was still 30 seconds, all of them cast with Presence of Mind active. Doubt I need further testing.