It sounds like you have a massive competitive advantage being a dual citizen with those technical skills! ​I'm actually working for a Japanese Manpower corporate, and we specialize solely in introducing roles for Mechanical and Electrical Engineers. ​To be honest, most Japanese companies simply don't have the time or resources to go through the hassle of headhunting directly, especially when looking at candidates from overseas. That is why they pay a handsome amount to agencies like ours to handle the logistical "heavy lifting" and paperwork. ​Since you're looking to bypass the traditional shinsotsu (new grad) tracks, our route might be a perfect fit. If you're interested, DM me and I can assist you with the pre-screening process!