MTRX Studio HDX and Dolby Atmos Production Suite

[Goombot]

I've been using my MTRX Studio natively with the Dolby Atmos Production Suite but now with the Hybrid Engine I'd like to combine the Native and DSP of the HDX into my workflow. Obviously I will now be limited to 64 tracks and I cannot use the Dolby Atmos Bridge playback engine, so how can I use the HDX engine and still use the Dolby Atmos Production Suite? I understand the audio driver cannot be Core Audio in the Renderer preferences so the only other option is Send and Return plug ins? Is that really the only way to get it working with the Hybrid Engine?