Sorry, can't help specifically - but surely there are plenty of Japanese manufacturers who would appreciate your talents - do you have sales experience?
I would start by contacting manufacterers in Japan.
Japanese manufacturers are the way to go - I know of a guy who if fluent in Japanese & German and works for a large Japanese firm with operations in Germany as a translator. Perhaps you could do the same in Ireland.
I also know of a guy with Japanese who was hired by a Japanese bank in the IFSC. He had no finance experience - he came from a languages background. That may be another area to consider.
Perhaps you should contact the Japanese embassy in Ireland for help with contacts. Good Luck!