I wonder if “Choose among product images by position (1,2,3…)” is what you need?
Try it with one product and create a new column in your spreadsheet called “Image Position” and then map it to “Choose among product images by position (1,2,3…)” when you do the import. If blue is your first image and red is your second then put “1” in the first row where you are importing the blue combination and “2” in the second row against the red combination etc.
It worked beautifully! You're a mastermind!
I added a note here after experimenting:
To get the correct color to show up in the cart, create a column named "image position" and assign #47 "Feature" for the products import csv.
Then for the combinations import assign the column named "image position" to “Choose among product images by position (1,2,3…)”
I rephrased the same thing to show all the specifics in case anyone else wants to use this:
To get color to show up in cart use a column named "image position" and assign it to "Choose among product images by position (1,2,3…)" for the combinations csv import