I think this is a very good idea, or more accurately, a great brainstorm...
And I predict a couple of good knives come out of this...
This thread reminds me of the Japanese Kiridashi, which can be quite small.
I think I would combine two things....
The discoidal knife, and a leaf.....
Which, I would think that the the latter might have inspired the former....
But, if you made a leaf shaped knife, which would be much like a discoidal knife, that would be pretty cool.
But, what size are we thinking of? How long, how wide?
How about some articles, and drawings of actual knives of our ancestors for inspiration?
http://www.um.u-tokyo.ac.jp/publish_db/Bulletin/no06/no06002.html
And a leaf shaped blade...
Marion