PulseAudio as a JACK Client
I spoke too soon about not being able to get PulseAudio working as a JACK client. I found this post that tells you how to do it.
The key I think is chmod -s `which pulseaudio`. I didn’t have to start the JACK transport rolling, so that may be antiquated information. I did have to build some packages from source, though:
sudo apt-get build-dep pulseaudio
sudo apt-get install libjack-dev
fakeroot apt-get source -b pulseaudio
This creates a bunch of .debs, including pulseaudio-module-jack*.deb. I just installed them all, but you can probably just install the jack module deb. Make the changes permanent by putting them in ~/.pulse/default.pa or in /etc/pulse/default.pa and you’re in business.