Head: Are you forgetting a few important facts ?
The R22 Mariner is discontinued. The R22 & the R44 cannot be retro-fitted with floats.
The R22 doesn't have the spare weight to carry 2 ELTs.
The extra weight of all the proposed devices added to any light helicopter actually gives those machines less margin for error and therefore makes them less safe.
As for pax - they have a choice. They can be given the stats and take an informed, personal decision. (And I know what it would be.)
Finally, why should there be legislation to cover an event which hardly ever occurs ?
Let's concentrate on the REAL safety issues associated with helicopters : the most common causes of fatal and non-fatal accidents. Let's stop the wire-strikes, CFIT, settling with power and downright carelessness which costs lives and gives helicopters a bad name.
And let's realise that if you give people floats, ELTs and life jackets they will reward you with even more carelessness. It's like the question I once asked a car safety designer - "What's the safest car ?".
"One with a 12 inch spike extending from the steering wheel boss towards the driver," was the answer.
Air bags, ABS, anti-skid axles - they just give people some strange licence to misbehave. And flying can easily go down the same expensive route.