Alright! Y'all did it and I'm a man of my word. The helmet does, in fact, come off!
Throwing down the gauntlet this #VintageToyTuesday / #TrekTuesday If this gets 25 likes by 9pm Pacific today, I will open this 30 yo Playmates "Captain Picard in Starfleet Spacesuit" action figure just to see if the helmet comes off.