I'm trying to program a show using Sonar to multitrack off my laptop into a Behringer X32. However, in order to do this, I need to pull the sound board out of the truck o' gear and hook it up because Sonar hides all drivers that aren't connected devices. And I can't even work on a file that was done with the board connected, because Sonar automatically repatches to the current active driver. This makes programming a pain.
Is there any way I can keep all drivers active in Sonar - even if they don't work because the device isn't connected? That would simplify my life greatly. Thoughts?

No. The device has to be connected or Sonar will choose the next device. 
If you don't need to actually play and hear the projects then you could try disabling all audio devices. 
I have a laptop I only use with my Tascam interface and the on board is disabled. When I open Sonar the Tascam is still the audio device even if not connected, but everything is greyed out. 
 
I record my band into the laptop/Tascam system then I transfer to my main DAW for editing and overdubs. That system uses my Scarlett interface. Cool thing is the outputs remain the same because both interfaces are 1/2 3/4 and SPDIF. So I rarely have an output issue. A few times it defaulted to the SPDIF output but 90% of the time it stays with the 1/2. 
 
But it sound like your trying to set up your system for live playback and recording. I'm afraid that if you need to work with any projects the only solid solution is to always use the same device and have it connected. Example if your trying to make a template for recording you won't be able to assign the X32 inputs to tracks unless it's connected. 

If you set this to environment variables
set devmgr_show_nonpresent_devices=1
 
you will be able to see a listing of hidden devices i device manager.
It's on a menu if to list hidden, or not present - don't remember.
 
It might help to proceed with what you want.

Can't you map to your internal sound card?
You might be able to write a a couple of batch files or something to replace AUD.INI for whatever configuration you are in, and then run Sonar. You could then create a couple of shortcuts pointing to it.