Yes there is. Made by Deep Outdoors and also sold with rEvo Rebreathers. Deep Outdoors is pretty much gone now, but they still deal privately and probably have stock. The advantage of their buckle is that it has a slot in front of the buckle as well as the slots behind it. What that means is that if you have a 2-piece crotch strap with Fastek buckle release, you can thread the receiving part onto the buckle and it will always be there, hanging dead center for you to clip in. Sure, some folks prefer a one piece strap that they thread into the harness every time. But after forgetting a few hundred times, I learned to appreciate the 2 piece design.
There are plastic buckles that have the same design with a slot forward of the buckle. But the DO or rEvo one is the only stainless one I ever found with that feature.
iPhone. iTypo. iApologize.