It was our own
Rock Lobbster who made the mechanical flip visor:
Hey there everyone! I have been a part of the Facebook group for a while now but I have never posted here. So here is what I’m working on. It is a flip up ODST visor to show combat mode and the clear visor. I have a vacuum formed visor coming in soon (Thank you Sorren Tromp) for the outer visor...
www.405th.com
As for how to attempt to achieve the effect without the needing any mechanical or moving parts, many of our mirrored our tinted visors work on the principle of the vast majority of the light being blocked on the inside of the helmet. If you hold up most tinted or mirrored visors up on their own you can usually see right through them very easily. I once knew a fellow member who bought a mirrored visor on Etsy and when he got it was starting to complain that he thought he was ripped off as he could see through it and it didn't seem very mirrored at all. I advised him to try it on his helmet before he asked for a refund or made an issue with the vendor. Lo and Behold, once installed on his helmet, it was more than sufficiently mirrored and prevented him from seeing through.
That's a long way to go to just say, it could be possible to mount some nice bright LEDs on the
inside of your helmet aimed at the visor that when activated could negate the tint or mirroring effect of most visors enough for your face to be visble-ish. You won't be able to achieve the perfectly clear look of a mechanical moving visor, and obviously not like the in game or CGI in the We Are ODST TV commercial, but it might be a nice approximation for cheaper than moving visor.