NVME installs are probably fixed, thanks to the help of vishalrao
For anyone else wanting to try and install to an nvme device, get the KaOS 2016.03 ISO, and install the latest kpmcore and calamares in Live mode:
sudo pacman -U http://kaosx.tk/repo/build/kpmcore-2.1.0.3-1-x86_64.pkg.tar.xz http://kaosx.tk/repo/build/kpmcore-debug-2.1.0.3-1-x86_64.pkg.tar.xz
sudo pacman -U http://kaosx.tk/repo/build/calamares-2.1.0-2-x86_64.pkg.tar.xz http://kaosx.tk/repo/build/calamares-debug-2.1.0-2-x86_64.pkg.tar.xz
Your NVME device will now show in the device list in manual partitioning for example.