Help! -- I need a refresher course on Morph Channel Crosstalk.

(& please do clue me in if Ive made any mistaken assumptions here.)

My problem arises from morph channel crosstalk when using multiple characters that were created by using Full Body Morphs.

While using the various Null characters will eliminate the crosstalk, however this also disables all the FBMs in the second character (or, have I already made some error in this regard?).

So, to be able to use two such characters in a scene, I assume I must convert some characters FBMs back to individual MTs , but really not looking forward to taking on the zillion of individual dial changes this would require.

So, with all the experimenting with this phenomenon, have I overlooked or forgotten some easier method of accomplishing this type of reversion?

Or, was there altogether some other way to eliminate all the crosstalk while retaining the FBMs in the second character (like renaming a second base geometry .obj, or editing the .CR2 to rename the FBM channels, or some such?)

(re: P4 w/ V2)