But now I'm wondering if you can convert Sonar's automation to MIDI events so that you could port a project over to another DAW?
I've always used a virtual MIDI cable for that (Maple MIDI for 32-bit; LoopBe1 is 64-bit). Two MIDI tracks; the first plays back the automation curve, the second records it as MIDI. The drawing tool variations really come in handy here with this kind of conversion technique.
Automation (MIDI) Track: Input N/A. Output set to virtual MIDI cable.
MIDI Record (MIDI) Track: Input set to virtual MIDI cable. Output N/A. Arm for recording.
As for your original question, Bounce To Clip(s) - with a forced / redirected MIDI Channel dialed in - will convert all of your various MIDI Channel-ized tracks to the forced channel. If I recall this correctly, it will also force all MIDI notes to that specific MIDI channel. Selections are ignored. None / Omni preserves channelization on the Bounce (see brundlefly).