I'm just a novice in all this, but I did start the thread so... if Vuichard only works for IVRS, just how exactly does it differ from the conventional recovery? (a) You go sideways instead of forwards (b) you pull collective straightaway instead of drop-wait-pull.
(a)... so what? The rotor doesn't know or care about sideways, forwards or backwards. I guess maybe the tail rotor thrust potentially makes the translation happen a bit faster.
(b)... as long as you get out of the downwash rapidos and you were only ever in IVRS, dropping the collective probably doesn't make much difference. In fact my original instructor said something like "do it for the checkride but in truth there's no point because by the time you've dropped it you've recovered anyway" (which was ironic because he was also my examiner, but that's another story).
So the advantage, if any, of Vuichard is (a) you may get out of the downwash a tiny bit faster thanks to help from the TR and (b) you don't have the brief loss of lift due to dropping the collective.
If the difference between flying away and disaster is 20 feet, then I guess these may help. For FDVRS it's academic, but then what were you doing there anyway?