Well....I have 23,000 flight hours and over 12,000 of that is on a longline and I'm still here....
But seriously....if you are at very low to no airspeed you will be hammering that collective down to save rotor rpm...you will be doing a vertical auto anyways, so I would not worry too much about jettisoning the line.
We used to do verticals in jet rangers anywhere from 30 to 150 ft hovers....I don't know about an R44 only ever tried full on's with some airspeed and a flare....rotor inertia is pretty good. Seems to me if you did it right, you would walk away...but probably would have some bent skid gear. Go find an instructor capable of doing full on verticals.....lots of that done here in Canada.