Admittedly I’m not sure if it works for Japanese, but English has online tools you can use to print out a sheet to write out every character and scan to turn into a font file. Would be surprising if it didn’t exist for Japanese.
So ultimately you probably just need someone with neat handwriting.
Japanese fonts are much harder to make than English fonts. Thousands of characters and all that.
Admittedly I’m not sure if it works for Japanese, but English has online tools you can use to print out a sheet to write out every character and scan to turn into a font file. Would be surprising if it didn’t exist for Japanese.
So ultimately you probably just need someone with neat handwriting.
Someone with neat handwriting, a few hours to burn, and lots of patience