Being the old broad that I am, maybe I can give an element of perspective. I think you probably start itching on your beard before anyone else would ever see the rash (so to speak). A girl that is closer to my age, looks like a reverse panda, with white eyes and a dark dark dark place on her chin and cheeks when in male mode, but she has found her special brand of beard cover (its actually good old Derma Blend) and while those of us "in the know" can see some signs of "rash" at about her 10Th hour, her other cues to the world are so female that no one sees it unless we know before hand. She has had new girls (C and T) come up and compliment her on her complexion when the rest of us know she is starting to have beard itch, but she no longer feels it and goes on with life. Worst case scenario is to have a small touch up kit in your purse, and some hand bags are big enough to hide a Norelco Razor.
The other perspective is that most people on a full time job come to bond with you in a fairly short period of time, and no longer look at you closely, or even if seeing, their work with you is more important than your facial follicularity. I was letting my hair grow for my last two years of work, and no one noticed that the "boss" was looking a little strange and beyond shaggy, or they decided it did not affect our work relationship!! (It was like that from my bosses too.) When I did come out, the result was an OHH, but SO WHAT, you are doing a great job, why should we give a doggone? Big issue will be as far as the job goes, that you will do it much better and be happier doing it, and that will make you a better worker. The job will give you enough money to get the steel wool on your face removed.