No you wouldn't ordinarily be allowed. The permitted lists should be in the relevant part of your companies operations manual. Whatever anyone may think about the rules they are not up for individual interpretation.
Cunningplan. It is not your flightdeck, it is your employers. You are employed (I assume) to carry out the statutory obligligations imposed on your employer and forming a part of their operators licence and your own ?
In the UK, if you permit an unauthorized person "known to you", to be on the flight deck, in flight or during any part of the sanctioned prohibition period, you run the very real risk of losing your job, your licence, your livelyhood and potentially your liberty. That risk is amplified given that it only takes another crewmember or a passenger to report such an action.
There are many of us that regret the changes that were introduced post 9-11, but whatever our own views on the subject, it would be grossly negligent to ignore them ( however much contempt one feels), as much as it would be to choose whichever other rules we might decide to ignore.