Vessel make a JIS screwdriver. Not cheap. I use a Draper 19533 No.2 size, which don't claim to be JIS but I've found the profile to be the same. Not sure what size you need?
The one I got.. a lot cheaper than a Vessel or Park Tool...
https://www.ebay.co.uk/itm/DRAPER-19...:rk:2:razz:f:0