Getting back to the topic of flying in controlled airspace, as a trike pilot it's pretty difficult to think that I could enter CTA to the letter of the law and trikes, being the flying pendulums that they are don't take too kindly to being flown low over mountainous terrain when any wind is blowing.
So, my point is, what can be done to ensure that we can all enjoy a nice flight all the way up the east coast of our beautiful country without having to make dangerous excursions inland or out to sea.
I cannot justify the expense of a transponder in a trike and have not ever seen any hint of transponders for hire for that once in 10 blue moons when one might be useful in a trike. (Apart from endorsement requirements)
Sydney's Victa-1 VFR coastal route is a good example for the other major airports up the coast to follow where there is class-G airspace that as far as I know Ultralight & Trike pilots can fly through with ATC radio clearance and with no transponder, but what about places like Coffs Harbour, Gold Coast and Maroochydore.
There could be some local arrangements for "No Transponder" ATC clearances but they would not stand up under legal scrutiny under the current rules.
Cheers,
Glen