StreamSAK now has limited keybind support for counters! It is a little buggy in some instances, so I will probably push a release in the future to smooth some of the bugs out. In the meantime, it works great! Enjoy!
Check out the newest version of StreamSAK (v2.2). I don't think there will be too many updates after this, but I thought about it this morning, and I wanted to add just a little more functionality to make the experience just that much more user-friendly!