A tire iron, which could really freak some people out, and probably will have a hard time fitting into a security door jam is not a good idea. Go to the hardware store and get a small flat prybar that will be easier hidden, weigh half as much, and do a better job. Upgrade the flashlight to a good D-cell maglite, these are cheap tough and can be left in the desk drawer until need. Mine personally had to be used as an emergency hammer one day (really serious beating) and it still works. Maglites are also for handling unruly persons, thats why cops carry them.

If you want to camoflouge your gear at work think about making a five gallon bucket you can put it all in to grab and go, into a stool. Maybe a cover exist for such thing or you can make one thats just an idea.