You need:
- Empty hard drive, or be prepared to wipe your drive.
- USB stick with LibreELEC installation files
- A bootable GParted Live USB stick or your favorite partition manager
- Windows 10 installation media
...
Nope. This wont work. You have to install both OS in UEFI (GPT) and EASYBCD wont work with that. Must be mine Intel NUC who f*uck it up in that case.