I have a Zebralight Headlamp, but not at work. I probably should get another and just keep it at work.Have you considered adding a headlamp to this setup of yours, iacchus? Seems like it would be more ideal than a mouth light, and more secure too.
Otherwise, a diffuser would go great in small confines like this. For barely any bulk and practically no weight you get ambient light without any glare from the beam striking the bounce surface before diffusing. Especially metal.
The low mode of whatever torch is in my pocket usually does a good job at avoiding glare, I don't have a major issue there. A diffuser would come in handy though, now that you mention it. I'll see if I can sort one for the Beta QR and slip it in the pouch. Good idea.