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A fixed blade knife that can be easily employed is never a bad idea. Easily employed is certainly a key part of the definition, though. You, with your fitness and awareness levels, may believe yourself capable of assessing the threat and getting to a knife carried on a leg or arm, such as the knife you mention. That may go out the door if you are surprised and find yourself pinned under an attacker.

Since most of us walk around with hands loosely at our sides near belt-line, and since you mentioned carrying a belt/fanny pack, I'd suggest finding a small (<3" blade) fixed blade knife in a friction-only sheath that can be carried on the belt horizontally near mid-line in the front. This can be accessed by either hand (one in a reverse grip) and can be employed immediately once it clears the sheath. When away from work, I often carry such a knife so that it is in a reverse grip (blade out) for my strong hand, providing the ability to "punch" with the cutting edge or stab in an ice-pick manner.