Would you consider using high quality cables to make your own? That would solve your size issues.
Power cable with small connector / termination
I am planning to make a change to move equipment to a more accessible location on a built-in cabinet/bookshelf in my house. The electrical outlet is in the lower section behind closed cabinet doors, but I want to have equipment on top of that, in the open area of the bookcase. This requires me to drill a hole at the back of the bookcase through the top of the lower cabinet so I can pass the power cable through it. I'd like to use a quality cable but all of the ones I currently own have gigantic heads on them and I don't really want to drill a 3 inch hole through the cabinet. Does anyone know of any power cables that have slightly more reasonably sized terminations? At least at one end, as I only need to feed it through one way.