Dual boot, although I usually prefer to drop it rather than go to the trouble.
I wouldn’t recommend virtualization, not only do you lose performance when you need it most, but (depending on the devices and system) setting everything up properly can be very tedious.
They are actually quite aggressive about blocking disposable emails, most free services don’t work. I have used protonmail a few times for semi-disposable accounts that used disposable emails to sign up, and some of them were banned later.
Telepathy is typically used for mind-to-mind, but here there is an intermediary. I guess better something like mind-reading.