OK. For the last time, there is considerable confusion going on here. The "SWITCH SETTING" instructions detail how to set a switch when you are turning on or off a function, not a control channel.

If you set a channel to a switch, you have only a few things happen:

With a 2-position switch, you have controls that work as "one end/other end".
With a 3-position switch, you have controls that work as "one end/middle/other end".

NOT "ON/OFF"

For your hook and air brakes, you basically set two channels to be operated by one control, the desired switch. Then, you set the positions for each control as necessary. There's nothing that says you cannot set two different channels to the same control. You don't need to use a mixer.