Yeah, I don't think that'll work in practice. Unless your OS is real-time, what you described cannot work because audio latency has to do with more than your DA

Yeah, I don't think that'll work in practice. Unless your OS is real-time, what you described cannot work because audio latency has to do with more than your DAW's threads. It also has to do with OS polling MIDI data, or sending data to audio driver. These need to be completed on a deadline. Realtime scheduling can be less efficient than fair scheduling which is why if your DAW has all the power to set its own scheduling you'll only do compute, and not enough IO. This means poor latency.