What I enjoy about the Japanese is they unabashedly adopt things that are already perfectly useful. Hence British SU carburetors on the first offerings of Datsun 240Zs, and Chevy engines and drivetrains in the hugely successful 70s Toyota Landcruisers. Looking at the meagre postings of pictures of uneventful-looking single blade Japanese pocket knives makes me suspect that SAKs sell very well over there and no one (aside from China, for obvious reasons) has even bothered trying to compete with them. Buy her a SAK and get a local engraver to carve some meaningful Japanese script on one of the scales. Researching for this and providing a template in itself will show that you've done your homework. There's even a unique fellow on this forum that specializes in modifying SAKs to have custom blades and accessories, and you could ask for the primary blade to be typically Japanese-looking (Tanto style or whatever).
Sorry to sidetrack this thread on to non-Japanese-made but this is something to consider if their off-the-shelf pocketknife offerings don't amount to much.