for you Zigma <3
Its easy to do. First, you need someone with the gear you want to put on the check. Then you have the target of your rigged check not wear equipment in the slots that you want stuff from the original to go in. Hence me being naked in the third picture. Check the person with the original gear and imediately hit + before the window can come up and show equipment, it should still display the target's title. It might need to be a little laggy like lower jeuno. Then you check the person with the empty spaces and, there you go. Go try for yourself. Not sure if anyone really cared that much but just thought I'd say something.
Translation:
Step 1: highlight a person and put your cursor on the check button, before you check someone hit the + key on your numberpad and when you check them it will display only their title, a window will not pop up.
Step 2: check yourself but do not press the + key before doing so. the gear they have will fill in the equipment slots you are not using, for example, If they have a Kraken club offhand equipped, and you have no offhand weapon equipped, a Kraken club will appear in your offhand equipment slot.