I believe that under normal forces this very unlikely to fail, but should Murphy rear his ugly head, think about one of those rings loading on the gate.
I bought one for multi pitch rock climbing. The double gate is far more intuitive than I thought it would be and it's great for keeping the belay station organized. I have yet to find a good easy to incorporate it into my work system. I do have a couple Grivel twin gate ovals and HMS carabiners...
I
I don't think this counts as splicing, but I made a this lanyard also. Sterling climb spec webbing, 1/4" bungee, SMC rap ring, polyester upholstery thread. Stitching done by hand then coated with SeamGrip. Did drop tests with 15 lb dumbell.