[modeless]

Haven't you just described Android's existing work profile feature? It works exactly like that as far as I'm aware.

Work profile requires explicit support from your IT department, but Android also supports multiple user accounts on one device (each gets their own lock screen, home screen, app switcher, notification shade, settings, installed apps, etc), so you could segregate things that way too if you can't get your IT department to support work profile.

I feel like multiple user accounts is an underappreciated feature of Android. I just got an iPad and it's a real drag that you can only have one Apple ID logged in on it, one set of apps, one home screen, etc. Tablets are made to be shared.