I like the Benchmade Mini Grip solution that a lot of people have said. Sounds like a good fit! Another option to consider is a fixed blade neck carry. Maybe an ESEE Izula, Tops Tibo or Becker D'Eskabar?
Funny you should mention ne k carry!
My wife and I both love them, got some from AG Russell, and loved them, but the sheaths were not the greatest and we gave up on them when the knives started dropping out.
Where would I find a medium-decent kneck knife?