Volume Control with 6 speakers:/

Hi there! So I just recently had a house built and I had them add 8 speaker drops for in ceiling speakers and 2 volume control knob ports (1 for kitchen/family room and 1 for the patio). Little did I know I can only add a pair to one knob. So my idea is run the patio direct to the receiver, and then run the other 6 speakers to a switch then back to a volume control knob then to the receiver. Anyone got any ideas? These weren’t run the way I wanted but I don’t want these fools wrecking my drywall to rewire.