Just remove the rear speakers from your present set up, put them away and readjust the settings...
Or buy some thin wall mountable speakers for the surround sound. The ones I am using now are <25mm thick. route the cables along the walls behind dado rail.
Can you tell me what ones you have? Am intrigued? I kind of want to get a newer set. My setup is about 5 years old now, so needs a facelift.