I eventually rewrote it here: https://github.com/t3kt/threshold
, which uses shared code that can work either in a TD C++ chop or in openFrameworks-based C++ applications.
There are still some bugs though. If you want to fork the repo and fix things, you can submit pull requests and I'll merge your changes into the main repo. Otherwise you should be able to report issues in the repo (probably in the "threshold" one, rather than the older "DistThresholdCHOP" repo), I'll try to get around to it when I have time.
The debugging process with C++ OPs is rather cumbersome, so at this point I'm leaning towards doing it in a GLSL geometry shader of some sort, though I'm still figuring out how that would work. I also put together a really basic version of it in a ScriptSOP, though it's way too slow to use for anything big.