hmmm. I'm not quite getting what exactly you mean... so hard to communicate certain things in text!
Definitely hard to communicate in text sometimes!
I originally looked over the photo of the sling too quickly. That, followed by thinking about it without a clear understanding of the build has probably led me to the wrong conclusion. It is, in fact, just like a loopie and should be fine.
I think seeing the 2 handles gave me the idea that it had two adjusters in the same throat, but that makes no sense at all. Totally my bad here.
Understanding it now, I would say the only potential drawback would be that at some range of adjustment, the throat may not be centered as the bar of the girth hitch, which may or may not be an issue at all.
It also leads me to imagine another piece of kit... One loopie, free of hardware, and a L-Ring to L-Ring prusik added in, English style. Does that make sense? Since the loopie wouldn't be retrievable anyway, you can run the 2 L-rings, but be able to position them on the loopie for best location based on adjusted length.
