How can I integrate my sound modules with the mpc?

I have a triton keyboard, a xv 5050, a proteus 2000, soft synths, and a roland varios and don't have access to all of them at once.
This is my hook up,
output:
A = triton
B = soft synths
C = xv5050
D = protues 2000

Here is the problem, I want to be able to use the varios but it only responds in midi\ omni mode ( all 16 midi channels at once), so I can't hook it up to the midi thru of any of the other sound modules because it will respond to all channels of midi information that is being sent to the module that it is connected to. Does anyone have any solutions as to how I can intergrate my roland varios into my setup?
Is a midi patchbay a valid solution?
Thanks for the help.