You'll need a splitter box for this as well:
View attachment 3084382
The push/pulls for the treble cut pots will look like this:
View attachment 3084383
The pin-out for those switches is:
View attachment 3084384
Here is the pin-out for on-on-on switches, which might help you with TRS output switching:
View attachment 3084385
If you're not sure which you have, just check your switch using a multi-meter set to Ohms.
None of what you currently have will work, not even the treble cut pots.
(OK, the volume pots seem correct)