PJ: Just for kicks I looked on Ebay and there's a couple of sets of decals for your Ki-43. Japanese, Indonesian, Thai, and Chinese Nationalist, Communist, and Manchukuo (Japanese collaborator government). To be anal captured Japanese aircraft aren't within the GB but I'd be more than willing to let things slide just to see you get her built.
BTW: None of them are cheap though. Twenty-five bucks including shipping for a set of decals is rather on the steep side for me.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=1%2F32nd+Ki-43+decal&_sacat=0