Assuming you have a C/C++ compiler installed (comes via XCode) it really takes like 2 minutes.
Lazy alternative, in a couple days maximum Homebrew should be updated, unfortunately it doesn't depend on us.
Also, notice that sysdig for OSX doesn't (yet) have live capture, so you'll just be able to run the chisel on a trace file that you previously created on a Linux host.
Yes, we most definitely can publish a private brew tap. I'm no expert as I mainly use Linux, but my understanding is that I'd need to create a brand new draios/homebrew-sysdig repo. I'll try to find the time to look into this and update the documentation. If, instead, just a PR to our main repo would suffice, feel free to send it over and we'll merge it in no time :)