I have always disliked the “MIX” method of making a 6-channel switch out of 3 position and 2 position toggle switches. When things go wrong, you need to do the right thing immediatly. It is much easer to rotate a labeled switch than to figure out what to do with two switches.
For this reason, I use a small GRAYHILL 12-position rotary and a series of resistors to make a true 6-position switch and connect it to one of the potentiometer inputs of the radio. Most rotary switches have the provision for blocking some of the positions. Using 6 of the 12 positions uses a bit less than 180 degrees of the possible rotation.
I have made this modification to several radios - Turnigy (FrSky), Spektrum, Jumper, RadioMaster. If anyone would like information, I can provide some ideas and pics.