I am going to give away a secrets here. You don’t always have to “carry” a cane. That is just for the times you are on foot in a potentially dangerous environment. Most of us spend the majority of our time in only three or four places. We are at home, at work, in our vehicle and a few other places we frequent to do our recreation and socializing. If you ever are a victim of violence it is statistically likely to happen in one of these places simply because that is where you are most of the time. Rather than carrying your “walking cane” in and out at work every day you can prearrange to have some other suitable object close at hand that appears to serve some other function. For example, a school teacher I know has a pull down map on the wall right behind his desk that is seldom used. He replaced the pine dowel rod that was sewn into the bottom of the map with a length of steel pipe. Not only does the extra weight make the canvas map hang straight, it gives him the option to use it as a weapon. In an emergency he can get to it in just a few seconds. He also had enough sense not to tell anyone at school that he had replaced the light pine dowel.
Back when I worked at a bar I kept the but half of a two piece pool cue handy at all times. Being that there were several pool tables in the room, pool sticks were a common there and would not look suspicious. If something went wrong and I had to use it as a weapon it would appear that I spontaneously grabbed up something in the immediate environment and it was not premeditated. Again, I kept my mouth shut and did not tell anyone that I regularly practiced hitting the heavy bag and picking individual leaves off the bushes with it. BTW, there is no law against carrying a two piece pool cue in your car either, as long as you have both halves.
Is there some type of stick, tube, pipe, tool or handle that you can have close by at work that would appear inconspicuous? Use your imagination. No one has to know why it is there and unless there is an emergency they will never even find out.