Full disclosure: The same question was asked at Seasoned Advice and I am re-posting my answer from there with minor adjustments.
I would invest in a small thermos bottle, about the size of what you need for one day. They are not only designed to keep hot food hot, they can also keep cold food cold. Choose a size that will be as full as possible when you start, it will keep better. I prefer stainless steel, because it can be cleaned easily and thoroughly, even in case something goes wrong, like a forgotten thermos that reappears after a while. (Ask me how I know >.<)
This is what the small B&B we were staying at a few years ago supplies to their guests. If it’s good for an early morning tea, it’ll be good for afternoon coffee as well:
If you want to go all the way, you can pre-chill the container, then fill it with well-chilled cream from your home fridge. You could even freeze some of the cream as ice cubes, if you find that it doesn’t stay cold enough until the end of your work day or your last coffee break. Store the thermos away from heat sources and not in warm sunlight, of course.
Note that you also have the “two-hours in the danger zone” buffer and that “unsafe” doesn’t automatically mean “spoiled”. Especially when the cream is still quite cold and only shortly after the two-hour window the risk for a healthy adult should be small. No recommendation, just a thought.