Thanks for the reply.
I haven't went down the steam route yet, but, I did get an install working with KDE plasma 5.
I can still boot windows with the UEFI boot menu, I just had to disable secure boot.
I haven't bothered to try and make grub look for windows, or to enable secure boot for funtoo. It takes me all of 5 seconds to go into the menu and boot whichever one I want.
I may wait until 1.4 for the steam stuff anyway, since I have steam in windows
It appears lxd benefits heavily from btrfs and zfs, which I don't think I have a good way of running unless I create a loop device over xfs, as I ended up keeping a super simple partition layout (boot, swap, root), and I'm out of spare disks at the moment.