Here's the command line to install Movie Maker. You also have to install Picture Gallery, it's a prerequisite. I didn't want any other apps included either, but this was as trimmed down as I could get it. I can look up what the switches mean if you need to know. It's been a while since I set it up.
wlsetup-all.exe /AppSelect:MovieMaker /NOToolbarCEIP /NOhomepage /Nolaunch /NOMO /nosearch /q