Outstanding....if you can put a small rail segment on, with a QD socket in it, that would work well. I'm quite sure I've seen those available. I've been 100% satisfied with how mine have worked. It's been through multiple training courses (2 & 4 day) and I've never had the AR come off the sling.
Since I wear mine across the front of my body, having the swivels on the side of the AR allows it to lay flat and it doesn't try to flip over. If I were wearing it over my strong side shoulder, I'd have the attachment points on the bottom of the AR like a conventional sling.
Sounds like you have a workable solution!
Edit: Forgot to mention...I use the padded VTAC sling on my FNH SLP shotgun. I use the regular VTAC sling on my M&P15, as can be seen in the above photo. I really like the sling. The ability to adjust it one handed, while moving (if necessary), is great.