Visa process for same-sex spouse of a JET

In short, my partner and I are about to get married and hopefully move to Japan together while I am an ALT. Filling out my 'reply form,' I read that same-sex spouses are not recognized in Japan (knew that) and he would not be eligible for the typical visa.
Based on my surface-level research, it looks like a Designated Activities Visa might be an option.
Do any JETs have experience with this, or know someone who does? I'd really like to speak to someone who has been through this process or knows about Japanese immigration law.

Thank you!

by Federal_Ad_362