OOW;
I'm pretty sure the B47/B206 have wind speed and gust limits, but they are pretty high, just to protect from mast bumping. I've no technical knowledge of the Robinson series (only spent 22 mins in one in 25 years/10 000 hours rotary) but I seem to remember that Robbos also have wind speed/gust limits, in fact it may even have been the cause of a fatal in the last couple of years. Certainly a pitch down of nearly 90 degrees would probably cause mast bumping with all the possible outcomes that implies.
A rigid head like the EC135 would be fairly bumpy but if flown in VS mode rather than Alt Hold would be fine, something like an A109 or S76 would definately handle a lot worse than a 172 ever could in far greater comfort.
From gliding days I remember flying in conditions like you mention and once cracked the canopy of a Pirat with my head
SND