I'd hear of the plan to salvage as many of the ships as possible but never of simply handing them over to the League of Nations, it raises questions such as who'd man them, where they'd be maintained/home base, if they did fire in anger how would the member nations react, we know that nations did just up and leave when they never agreed or were on the receiving end of the L of N sanctions. I can't see it being a practical arrangement and in the long term they would have to pay for the upgrade and eventual replacement of these vessels.
(Bit of trivia about the Scapa Scuttled Fleet is its steel is a prime source of low background radiation free steel and there are suggestions that some even made it into the Voyager space programme).