You seem to have ruled out every option except getting an electrician to extend the circuit from the existing socket by crimping new lengths of cable on, put a socket somewhere else and replace the old socket with a blanking plate....I am posting here to find out what #1) is as I have no idea and hopefully I have made that clear.
Perhaps you should re-read my posts here then. The only option I have definitely ruled out is cutting holes in my bookcase. Frankly your posts have not helped.