In the pictures you see the easiest of the mod. The other two pots required trace cutting and rerouting of the trace. Nothing a dremel tool can't cure.
See I have a strong background in RF. I have been modifying circuits for a while. Matter of fact, I was once in the custom RF amp business. With these I have to start with a blank sheet of heavy gauge copper and create the traces all on my own. I really don't know another way to do. Therefore, when making mods like this one, circuit work is not strange to me. It's common practice.