The beetle is likely in the family Ripiphoridae. Wedge shaped beetles. Very interesting beetle, read
https://en.wikipedia.org/wiki/Ripiphoridae
There is also information at the "Atlas Of Living Australia" website.
That is why those beetles are on that flower! Amazing. Thanks for sparking my interest to research this. In the dim dark past I studied Botany and Zoology to BSc with a great interest in entomology. As a child I had glass cases of mounted beetles, moths and butterflies, and an array of animal skulls hanging on the bedroom walls
Weird Mark