Dear Koichi and Piers, thank you for your support. I now clearly understand that my project was far beyond my capabilities. Each additional difficulty, however, has forced me to reflect on the complexity and cultural value of these hakogaki, and on how unfortunate it is that they are so undervalued as art objects in their own right.
While this compilation may prove less useful than I had hoped for the transcription/translation of these calligraphies, I nevertheless hope it will contribute to the preservation of Satō-sensei hakogaki and help prevent the associated tsuba from being randomly distributed among other kiribako.
I have a few more requests for help, and I'm about to release the final draft (I promise, regardless of what condition it's in...).