I have found that Kodachromes are the least responsive to cibachrome, but with that said not a big problem
I have done colour masking in the past on cibas and Ra4 prints for colour casts . ie brides white dress which prints blue on RA 4 can be easily fixed with a filter on your dodging and burning tool, basically changing the balance for that specific area.
We are daily doing this with PS now for our Lambda colour prints.
As well making a silver mask with separation filters on pan masking film can be effective in boosting areas of local colour relative to the overall balance. As PE suggests this is quite possible.
I would think Donald Miller would be a good starting reference guy for masking as I believe he has good reference starting points. Ilford had old manuals of silver masking techniques in the heyday of Cibachrome printing, There was a guy out of California *Pace* who seemed to produce manuals on some of these techniques.
As well there was a guy out of Kansas City , who did a lot of complicated colour masking on a Lisle Camera , preceeding PS.
I worked in this field for years on a Lisle Camera and we were required to know how to do all levels of complex masking, Unfortunately , I did not keep my working books on these proceedures so I can't pass any pertinent info to you.
I would think though you should be able to produce all kinds of complicated unsharp masks on your LVT unit using scan to PS to LVT recorder???
I would start this way as trying to do this in an enlarger with seperation filters would be harder than using the tools that I understand you already have at your disposal.