I think you should re-think your workflow 
DT helps here more than you seem to be aware of.
Normally - if you import raw & jpg files each “pair” found will be put in one group. What happens if you do rating, color buttons.
If
a) you work in single image mode the rating is applied to all selected images, ok?
b) you switch on grouping mode you will see 1) just one image of that group and 2) the rating you set will be applied to all images in that group.