I would install a second pair of speakers in the kitchen and use zone 2.
If not this, than it is a perfect opportunity to assemble a secondary, high performing portable system that can be stowed away between use.
Someone I know, recently approached me to build them a subwoofer on wheels that two satellite speakers and a small amp will fit atop of, that he can stow next to his sofa or in a closet when not in use. He wants furniture grade finish, and a sunbrella dust cover to keep it contained and clean. He wants the satellites to be able to be separated for stereo.
I'm thinking of making him (or me, for that matter) a slick looking portable system based on the Carmody Speedsters.