After using this setup for as my 'mode' switch:
it worked OK :)
But I decided to take it to next DIY level :)
so we need to pick one of them that we going to replace with any available 6 position rotary switch.
(I have this one and it fits right)
Unsolder the 3 wires from B5K:
Next we need to make a small array of resistors that will act as B5K pot, when we switch to different modes.
The brown wire ( middle one on B5K ) feeds different voltage to the radio channel.
Now we need to add the switch that will connect the brown wire to each position.
And now we have solid 6 modes switch for APM and ACM :)
This is a "kitchen table setup" so if someone can measure better resistors value, pleas do :)
Its much easier than trying to setup some channels mix in this radio :)
Hope it was helpful.