I play music to do this. As in, I perform it on my guitar, sometimes while singing. Performing music uses your entire brain, so if you're doing it right there's almost no room for anything else while you do it. Feels like a cheat code for my brain.
Meh, Nvidia ARM is probably going to be an integrated chipset like the Jetson boards, the Nintendo Switch consoles, and the Shield devices. I'll be impressed when the ARM hardware ecosystem adopts a modular style like the x86/x86_64 ecosystem.
Personally I just installed Mint instead of Windows. If you back up your important files to an external drive, then what's the harm? Even if you need to go back to Windows, that's just another USB flash drive setup.
Sense of humor