Scorp,
I may be wrong (and I'm sure I'll be corrected if I am !!), but we do another check at idle called a "Stick Jump" check which should give the pilot some assurance that your scenario won't happen.
All we do is switch off each system in turn while guarding the collective with our knee, i.e. both feet are still on the pedals but the left knee is bent over to prevent the collective rising uncommanded. This is done at the same stage as the "Creep Check".
Hope this helps.
Cheers,
NEO.