How about using a Woodhead pendant station?
I like the 34047 style on the bottom right of this page:
http://www.woodhead.com/data/current3054/multitap%20902.pdf or the style on the bottom right of this page:
http://www.woodhead.com/data/current1486/GFCI%20Outlet%20boxes%20902.pdf They are designed to be hardwired.