I toyed with building an application like this, except that you just carry your device with you. The application basically tarballs your entire environment up, offsites it, and then wipes and factory-resets your device (incidentally I got lost in the rabbit hole of trying to wipe an SSD heh). It's completely clean, you can surrender your device for inspection, give passwords, etc. And then after you're through, you download the application which acts like a dropper, and it explodes your environment and data onto the device again. Docker was really useful here.
It would have been configurable. The important thing is that your blob of data (e.g. VeraCrypt volume) is offsited and wiped. You could leave your laptop otherwise completely lived-in, just not containing your data anymore. Otherwise, I've worked for companies that gave out loaner phones for overseas travel. A factory-reset phone is much less suspicious than a threadbare "factory-reset" laptop.
