I thought about this for a long time, and the answer that I finally got was the knife on a Skeletool CX.
I know, not a "proper" knife. But look at it this way: if I feel the need for a "gentleman's knife", I am probably not going to be able to bring the rest of my usual kit with me, and I am likely going to deal with people who may react adversely to a "knife" regardless of it's size, shape, or color.
I know of at least one person who regards the Boker Nano as a "dangerous weapon".....
But I digress. The point is that the Skeletool provides me with some of the same utility as my regular pocket kit, but it's perceived as a multitool, so it accomplishes the same goal as a "gentleman's knife", which is to package a cutting tool in a form which is more acceptable for use in an environment which is generally less knife-friendly.