I don't know how you dress at work, but I had this thought when reading your post. Why not just wear your holster all day? Does your place of employment ban wearing holsters?
I grew up in an era where school dress codes required boys to tuck their shirt it. I have actually seen teenage boys get paddled for having their shirt tail out. Of course, this became my habit and I ALWAYS tucked in my shirt no matter how I dressed. When I got my CHL went through a rethinking process about that, and decided that wearing my shirt tail out was no longer a stigma of slouchy behavior. So I began to wear my shirt tail out, and guess what, nobody cared. If you can wear your shirt tail out at work, why not just keep your holster on all day and get a lock box for your gun?
Edited to add: There have been several times when a doctor or nurse made a friendly comment to me about my empty holster.