Here's a novel idea for you: order a set of the euro swivels AND a set of American swivels from NECG. You can then swap the loops between the Euro and American QD part, thus yielding a QD swivel with the wider standard 1" American loop but with the narrower and thinner pin Euro QD attachment that will fit the Merkel swivel stud. Voila!!! Problem solved through a bit of tiny creative parts swapping!! Then you can likely fit your WR strap assuming it's a1" wide strap.