What some seem to be missing is the military style ITO being discussed by Crab and some of us is that ITO does not require any SAS/Upper Modes, and totally ignores PC1 criteria and cares not how many engines the aircraft has.
Folks....it was done using Bell 47's (with UH-1 standard Instrumentation) by the US Army during the IF Phase of helicopter flight training....and has been done in some form literally all around the World in all sorts of helicopters by pilots trained in the technique in both single pilot and multi-pilot crew situations. The imposition and strict obedience to artificial standards such as PC1 and other requirements done with very good intentions do not always produce the best outcomes.