Re: Personal heaters
"Lost access", you say? That's easily remedied.
My solution would be to come in earlier than the $SENIOR_MANAGER, and make my coffee then.
Access controls, you say? Nothing that can't be defeated by a correctly sized prybar.
"Executive access only" is kind of a red flag for me. Client kitchen? OK, there's a reson for that, and I respect it. But when the few appropriate something that clearly benefits the many, well, then it's time for revolution (or subversion)!