
and the front sling swivel here:

I gather from the second photo above that the Magpul clamp will accept a QD sling swivel.
Here's what I have come up with, but have not bought the parts yet:
Magpul clamp with QD swivel in front, with a L&M single-ring magazine-tube light mount installed to avoid interfering with the swivel:

I don't run a sling at home, but when taking a class, slings are pretty much required. Alternatively, I could run the light mount at home and add the swivel only when attending classes.
Suggestions and comments from those with experience on similar setups will be appreciated.