The Kasper rides very low when clipped to your pants. I work as a software developer,
and as such, I do not have so many customer relations. Maybe your line of work suggests an office "codex" that prohibits the use of legitimate tools. I've had this folder clipped to my pants. People at work know me as a knife nut, so they know what to expect.
I think the most important thing is to never appear threatening in any way, especially when you open the folder. Do it quietly, cut your items, then promptly fold it, and reclip it.
My suggestion would be to wear the knife clipped to your pants, and if someone in a managerial position confronts you, let them know that you only carry it for utility purposes.
Another alternative would be to carry a very small lockback, say a Camillus or something, but have it in you pocket instead.
When you go home, you take your jacket, which has another knife in it. That one is never displayed to the co-workers. That one can be nastier...