I think the ideas that really work for paracord accessories are the ones like bracelets, anklets, hat bands and keyfobs. They're not necessary pieces of equipment so you really don't lose anything by unwinding them in a survival situation.

A belt on the other hand is usually a functional item that keeps your pants up and it's the same for shoe laces. A rifle sling makes carrying a rifle easier and a handle wrap makes a blade more comfortable to use and for a more sure grip.

I might think about wrapping the butt of my rifle with paracord though.