Aaron’s ideas above are very promising. Aaron, hope you’re in contact with the Dorico team. It’s good to hear virtual midi ports are planned in an update in the near future; for microtonal playback the accidental symbols would need to send pitchbend messages or some midi data, so that would also have to be implemented.
Before that there’s no microtonal playback in Dorico and we just have to wait for the VST3 implementation which is still a big question mark.