I am not trying to convince you: each 3D artist has his/her own process. But as I like simple things, I'm arranging the material this way, for example with Vic's irises:

Same arrangement for the sclera and the pupils. That way, it's easy to change the eyes' corresponding bitmaps: a simple drag and drop and all eyes' parts are replaced.
Furthermore: not all Vic's eyes are useable. In fact, few are as most have burned-in fake reflections, something I hate as much as I hate burned-in highlights in most hairs.
That way, it's easy to setup a few MC6's with those checked:

For what concerns the skins: I've stored a few MC6's fully setup, but not all: I like to interchange the skins.
Example with two characters: between both pics, I've swapped everything but the morphologies:

The result: with two characters, you make four :smile:

𝒫𝒽𝓎𝓁

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