Setting other playback outputs as default for Alsa2Jack

[Broomy]

My soundcard outputs sound for my headphones on channel 7 and 8, therefore I would love to be able to set these output channels as defaults channel to which the Alsa2Jack bridge connects when it starts up.
The problem is that I don't always use Alsa2Jack, only when listening music.
Is there a way when I activate the bridge that the right connections are made?
I'm launching the bridge with Cadence.