I've just modified both of my rifle slings in the same way, wish I had seen/remembered your post, it would have saved me a little head scratching! For those that are interested, you need some 25mm webbing, a buckle, and some three bar sliders (or whatever they're called). You don't even need an attachment point on the sling itself, I put the strap through the sling swivels at the top end. It seems to work very well indeed.
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