What about a neck knife, only 5.25" in length, and a blade length of only 2". Blade steel is H1 and is 3mm thick, so you wouldn't need to worry about rusting from constant contact with body sweat. I can't think of a name right now, so it's just called the Spyderco H1
Here's the concept blade on 1/8" graph paper:
Unfortunately, my Scanner isn't working properly, so I can just post a picture I took of it. Last name was blurred for obvious reasons.
