I've never tried Dolby Audio Bridge with a one system setup, but AFAIK Dolby Audio Bridge becomes the Audio Engine of PT (thus making a HDX system running in native without the possibility to use dsp) and in the Dolby renderer you can assign the speaker outputs directly to the Avid hardware. I don't think in this setup it would be possible to route the speaker outs to Dante (unless somehow the signal could be picked up by something like Source Connect Nexus and then rerouted to Dante, but that would be a long shot). I reserve the right to be totally wrong here
You can contact Dolby Germany, they are very responsive. I'll send you a PM.
Greetings,
Thierry