No problem! Man, the things you have to do when sharehousing... all of these are just suggestions in case anything works for you btw. I just wish someone had warned me.

For the headphones you can have a magazine holder sat between the monitor and the wall, and if someone knocks pop the headphones in there to keep them kind of hidden from casual view from the door before you answer. Perhaps slipped behind a single magazine so that sits in front if it needs more cover.

Not sure of your pocket situation but a key wallet might enclose your bunch of keys and deaden the noise. Also with some lanyards you can get keyrings with a clip on it, so you can remove the parts you want and clip a secondary keyring on and off your main when it's needed - or just buy one. If you need a smaller option to quiet the jingles there's this.