I have a remote dedicated server from Hetzner which you can usually only install Linux on, because I haven't paid the ridiculous 25 euros/month for Windows. However, they have KVM access and you can mount a .iso file, but it's buggy and not straightforward. The only part of the KVM which does not work properly is the ISO mounting and drive redirection. The keyboard and mouse works okay, so if I can get the server to boot into the Windows installer, it's easy to complete the process. I've asked support about the mounting problem and they said they "don't support the .iso mounting function of the KVM", and I'm on my own. So my only option is to install Linux, boot it up, then install Windows from right within Linux.
I do not want to dual-boot; I want to replace the Linux OS with Windows Server 2012 R2. I want to get rid of GRUB and all signs of a Linux filesystem. I do not care about preserving my old partitions or data. Is it possible to do this kind of installation?