I know this is a bit of a late and weird question, but would it be possible to have the 4 streams as distinct plugin outputs? 

I'm experimenting a lot with sperate processing (like additional reverbs and EQ) and surround/9.1.6 setups and while it is possible to duplicate instances a lot, having a bit more separated routing options would be super useful in case you want shared controls/LFOs and also cut down on wasteful buffer/plugin duplication.

I know my dream of a multichannel in/buffer/out version would most likely be its own completely new plugin, but unless I'm missing some quirky technical problem multi-out should be relatively feasible?

Hi
not a weird question at all, I got the same request a couple of times!
One output per stream is definitely possible in VST and CLAP but I could not get it working in AU. Didn't spend much time on it, so definitely worth giving it another shot at some point.

Full multichannel support won't really work in emergence, so maybe in a new plugin

I don't have anything new for now, but If you are interested in beta-testing such things in the future, feel free to join on discord
http://danielgergely.net/discord

Thanks for the reply! 

I see, I did not consider AU technical restrictions as I'm unfamiliar with that format, that makes sense. 

Appreciate the discord link, I'll hop in for any beta testing in case that could be helpful, but obviously no hurry.