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If you can completely delete all partitions on the hard drive and install into the raw space, I think windows might automatically partition it to its prefered Gpt provided your bios is uefi. Some bios you have to tell it to enable gpt, or efi. My 2012 model laptop has settings to use uefi/gpt or mbr, or both.
Create Windows 10 installation media Use the media creation tool to download an iso for use on another computer and let it make you a bootable usb drive - boot off it and do the custom install. When it asks for a key, click the part to skip it or do later and it should automatically self activate from your motherboard id/serial once online within a day or so, if not instantly.