Ah, I just posted about my experience below on this. I can confirm this worked for me, with no lies about "Assitive Tech" within the last month with 4 different OEM Windows 8.1 licences.
Yep, I've installed a fresh copy of Windows 10 using a Windows 7 key that has never been used to upgrade to Windows 10 before just the other week - it all worked without any issue, the system activated itself fine. No tricks needed.