@d-healey I was never able to work this out but I found an easy solution by just limiting the voices for each thing I want choked to 2 and putting them in their own sampler. Not the most realistic but it's all I can figure out for now.
I learn by tackling the problems before me, not necessarily by trying different things first. My main reason for switching to HISE is because I'm trying to build a drum sampler, not much else. Therefore any issues I have with building a sampler is something I HAVE to overcome because I'm not really trying to become a programmer or developer, just hoping to be able to create what's on my mind.
That all being said, I'm going to put this project on github once I'm finished building the UI so anyone else can use it as a starting block for their own drum sampler. Hopefully, more people working on it will help it become a really good starting template for others.
My hope for the future of HISE is to implement something along the lines of Kontakt's exclusive groups via UI not scripting because it's pretty useful to have.