Thank you to everyone for your input.
Having done a little more internet sleuthing, I have found one can purchase Yari in Japan with Hozon in polished condition for as little as ¥132 000.
Of course, one can also spend significantly more.
I have noticed before in woodworking forums, people have discussed wanting to use urushi for a project - the advice has generally been not to, not due to any issues with finish or quality, but merely due to the time, complexity of process, and the unfriendly nature of urushiol.
Clearly lasts well though.
Again, thanks to you all.