I thought of that except the core was going to go in the pantry and the speakers are wired to the home theater where I have an amp capable of a/b.
There in lies the dilemma. I;m probably leaning towards the duet at this stage but....
As you've spotted SqueezeSlaves have to be hosted on a Core, MD or some other host system. So in your situation I would suggest the SB Receiver would be the best choice to drive Zone2 of your surround receiver as they do not need a host system just power and a WiFi connection (or wired).
All the best