The only way to install Win2k into a directory other than WINNT, is to either perform a parallel or unattended installation right? Wrong. Another method exists that I haven't found documented elsewhere yet.
Solution: Create a set of four bootup disks. On Disk 1, open the file txtsetup.sif and modify the defaultpath=winnt entry, and modify it to your liking. Just perform your installation using the disks!