It's great that you've recognised working as a regular dream sign - that would be a perfect area to focus on!

Instead of setting alarms, you can associate reality checks with everyday things that you encounter often.
Every time these things happen, use them as a trigger to perform a reality check.
Some examples include:
- walking through a doorway
- sitting down / standing up
- eating / drinking
- someone entering / exiting the room
- going to the bathroom
- driving / commuting
- looking at the time
You can also personalise it with things relevant to your job, eg. greeting a customer, using a machine, (any activity you perform regularly at work).

If you work with other people, you can use a discreet reality check such as the hands-free nose plug, sometimes called an epiglottis block. This works in the same way as the regular nose plug, except you just block your airways without doing the physical nose pinch, and try to breathe in.
Checking your hands can also be done discreetly, just make sure you do pay attention because sometimes the oddities aren't completely obvious in dreams (sometimes you might have crazy extra digits, but sometimes it might just be hard to keep your hand in focus, for example).

As with all reality checks, make sure you truly question whether you might be dreaming as you do them, because sometimes dream-reality can be very convincing!

Good luck!