Are you sure about Bunbury? It’s one of the most welcoming airports I’ve been to, I think you might have meant it’s neighbour to the south
Exactly. YBLN has no real desire to foster GA ops at their airport. YBUN on the other hand is very GA friendly and I believe still no landing fees.
As for having to fill out a PPR form for Gympie. If all they want to do is collect some data on what and when the airport is being used, I can think of a couple of low tech, more efficient and less costly methods.