LoadSkin\ToggledSkin LoadSkin\\ToggledSkin LoadSkin\ToggledSkin
Inline Lua is intended to "return" some value to the section variable, but that doesn't mean you have to use the value it returns... It actually doesn't have to return anything at all.
That's an acceptable workaround. Hopefully the !CommandMeasure thing is a bug that is fixable. I have been dealing with that for over a year, and just assumed it was a consequence of LUA needing double backslashes. I never knew it was a bug!