its you use the tks on a v1.2 fw vci-100 its not going to work being that the controls send midi msg from v1.2 to v1.3. give it a try and see what Im talking about.
yeah you can use deck c, you have to modify you current tks. What I would do is get rid of the master fx if you dont use them and try to see if you can map the controls there. you have 4 push buttons & 4 knobs.