Anything other than "I am responsive to all communication at all times and happy to switch focus to whatever you need me to do at a moment's notice, boss" is go

Anything other than "I am responsive to all communication at all times and happy to switch focus to whatever you need me to do at a moment's notice, boss" is going to come back and bite you in the ass, isn't it. The way to deal with unwanted interruptions is to ignore them and then later claim you were so busy you didn't notice. No downside to that. (Headphones help with this if they've forced you back into an office.)