Go with dedicated blades. My EDC for daily duties is not my shiv. The hair splitting edge I re-polish every weekend is not conducive to exploring one's darker side.
From my use I've found a folder to be easier to put away after use, whereas the fixed blades I carry are quick to deploy but almost impossible to resheath one-handed. They also tend to have coarser (120-400 grit) edges or SpyderEdges.
For your EDC I would suggest a very different blade shape and edge to any sort of "stick 'em with the pointy end" device. Think about a waved Matriarch or Benchmade Adamas 175, for a reasonably compact yet sufficiently pointy tool.
As far as ease of deployment, I would try out a few different options at a brick'n'mortar establishment, looking for something that was preferentially quick - that is to say, easy for you to draw, and not for someone else to remove from your person and potentially use on you.
More to the point, I would encourage you to enroll yourself in force deescalation courses, with an emphasis on non-injurious restraint methods. As I understood your job description, your role would hopefully lead to employer-provided training of the sort.
All the best!