This is essentially a boiled down version of the Setup Knative with Kind without DNS headaches tutorial... but declarative. I'm not going to expalin anything here, I'll let the code speak for itself. But here's a roadmap to understand what's going on. First, look at kind-cluster.yaml and note the ports. Second, look at the kustomization.yaml and note the nodePort overlays in the kourier Service. Finally, do a brew install kind and you're ready to run the How to below. (I'm assuming you already have kubectl)
I've included a useful Makefile.
make kindmake knativemake curl
You may need to run make knative a few times because some stuff takes a bit to spin up correctly. It usually works if you run it once and then again after 20 or so seconds.