Minimizing loop usage for multi amp switching

[Gr8fulPickr]

Going to be diving in to the GCX and Ground Control Pro manuals today to figure out amp switching, but thought you guys might have some answers.

I currently have two rack-based preamps (SMS Classic - one channel AND Tube Works Real Tube II with clean and dirty channel). I also have a Louis Electric KR12 with 4 gain inputs (I have the footswitch, but haven't used it much).

I typically use the KR12 and the SMS Classic in a dual setup (not really Wet/Dry, but I'd maybe like to try that at some point). The Real Tube II isn't hooked up right now, but I manually hook it up every now and then to the same can the SMS uses.

I'm planning to get a 1x12 cab for the Real Tube II later this year and maybe dabble with W/D/W, but for now I just want to be able to do the amp and channel switching using a minimum number of GCX loops as I'm quickly running outta them.

I currently use a Radial Twin City ABY to switch between the two amps, but haven't looked at how I'd configure this to allow me to switch gain channels on the KR12.

1) What's the best way to configure this with the GCX so that I can run the KR12 and SMS Classic AND have control over the KR12 amp switching?

2) I'm using a 2-channel Mosvalve 962 with the SMS. I manually switch the cables when I want to use my cab with the Real Tube II. Is there a way to use the GCX and Ground Control Pro so that I don't have to change the cables?

3) How could I switch between all three preamps and do channel switching in the two amps that offer that easily without manually switching any cables?

4) I really only have a few loops left to work with. Is there another device I can use that will allow me to use only 1, 2 or 3 loops in the GCX and still accomplish all the switching I want? If not, how many loops will I need to use to accomplish what I'm after?

5) How does my Radial ABY pedal fit into all of this or does it not?

Thanks in advance. I'll be looking into all of this today on my own as time allows, but I'm guessing people here already know this stuff.