add pack language for Sony Alpha a1 japanese version.

[volsinea]

Hello,

This is my first post on the site, I hope it's ok.

I bought a Sony A7r V in Japan (so only Japanese as language) and I was able to add the language pack with Zadig and pcmca gui.

Is it possible to do the same method for the Sony alpha a1? Has anyone ever done this?
I searched but I only found information regarding the alpha 7 series.

Thank you in advance for your help because living in Japan I cannot buy a Sony a1 with English menu.