What's your H9's serial number. You may want to look at this post: https://www.eventideaudio.com/community/forum/stompboxes/h9-modification-midi-power
I have tried the yamaha one before, but I cannot guarantee anything nor can I recommend either one.
If I were you I may go with https://www.cme-pro.com/product/widi-master/ as it's newer. But again, I don't guarantee and you should do more research if you are sure this is something you want.