Well I'm going to compromise - lets make the periscope view only be available by continually holding down ctrl+shift+P, that should induce some painful wrists. The actual periscope view will be slightly too small to be of any use so there will be some serious eyestrain - I'll add some random jitter as well - will that do ? ;-)
Joking aside, how was the view through the periscope in turbulence - did it appear to make it worse? I have some experience of optical systems where the eye input didn't quite match what the ears and stomach were saying - result was frequent use of the barf-bag. Was this a problem?
Upside down gauges? It's little details like that that make all the difference.