Today, following an obvious impulse, I looked up the phrase “Ich bin ein HongKonger” on Google. For completeness, I also checked the variant “Ich bin ein Hong Konger.”
So far, there are only dozens of hits between the two variants. I would have thought there would have been more by now.
I suspect that phrase will become more popular over time. This post will no doubt contribute.
On the other hand, if you click on Google images, you can see that they are already selling the t-shirts and tote bags.