I believe that Dolby VS can be configured independently from the general AVR settings (just like Dolby HP can), and set for 3 channel. At least, on my only AVR with Dolby VS this is the case (Dolby VS Wide can be set to 3ch with the AVR set to 7.1 in general, and it just ignores all of the surrounds).
Some processors can actually have multiple speaker layouts programed into them that you can switch between, just like DSP modes, so that might also be a consideration (many of them are relatively expensive though).
Finally, a second decoder/processor could accomplish what you want (may or may not need a switch).
What equipment do you have right now? And how much do you have to spend on this?
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