Dick, some of the things you say here are quite comical....
Once the passengers know that they will be subsidising equipment in general aviation aircraft when there is no measurable safety advantage, they will object to it.
very funny.
Can anyone give me evidence that the scenario could be different to what I describe?
Yes. "Slater and Gordon".
Is it so hard to see an avionics conversion being similar to an LPG conversion, except that the govt wont be out of pocket for the avionics?
Bob, you say "in effect the passengers are paying for it". I don't see the difficulty with this. The money AsA collects ends up in general revenue, where it is paid out in farm/apprentice worker/solar panel etc. subsidies. I truly do not see what your issue is.