I've inherited my grandmother's antique bedroom set, and I want to convert the double bed to a queen. I know there are converter sets available, but they are all for hook-on or bolt-on rails. This bed has a keyhole rail system. How can we convert the headboard and footboard to accept hook-on rails so I can use the converter set? Is there a piece of hardware we can buy somewhere, or is this a major woodworking project (in which case I'm out of luck)?