Will aim for it again next year. I also did briefly look on Black Mountain at the time of last year's find, but nothing was in flower. (As a side note, I wandered off trail, managed to get lost right at the end of the day and had to be rescued by a friend driving over and walking to find me. This is my life. I now have a better mapping app on my phone for trails.)
I had a look on the street that the Mint is at when those eucalypts started to flower, but then I was away. I strongly suspect that the beetle could have come from that street as the timing fits. However, I didn't find anything at that point. I used my net.