dangerous words
but my view is that if you can't fly an S76 with both AP's out you maybe shouldn't be flying one. It is well within the capabilities of any decent pilot. We used to do AP out training from take off to landing so it isn't beyond possible. I've even had a TRE 'accidently' take out both ap's just as I lifted from a rig deck!!!! Always better to have a little warning tho.
In a two crew S76 if you think the person flying next to you needs a challenge, just switch off the collective trim switch and see how long it takes for them to notice and how they deal with it.(disclaimer:im not suggesting you do this without prior agreement and warning, oh and when finishd dont forget to switch back from SAS mode
)