Highly recommend you look for a job in the States while in Japan. It can be done using LinkedIn or other sites depending on your field. Explain to potential employers that you are still working in Japan but will relocate back to the states for the right position. Most companies including schools/universities will do the entire interview process online and send a offer. If you accept an offer then file for DCF in Japan (or Scotland if you have residency there) and go that route. We filed DCF in Frankfurt, Germany due to a job offer in the US that I got while living abroad. The entire process was virtual so I know it can be done. Hope this helps! Best of luck to you both!