Yes, it will work, but with (1) rattle like crazy on the lower sling attachment point, and (2) bind as stated above.
I like the MS3 and run one with the paraclip attached to a Magpul RSA, (rail sling attachment) on the upper rail of a free float rail. On the rear stock (Magpul ACS), I use the QD socket and a QD sling swivel and snap the paraclip over the swivel. Magpul also makes a QD paraclip adapter for the rear, which is simpler and smaller than my current setup.
I may upgrade to an MS4 with QD swivels on both ends and replace the RSA with the smaller RSA-QD which has a QD socket.
But, I do like the paraclip concept. They are very secure and lock firmly, where the push button of QD sling swivels can produce accidental sling detachment under stress.
The poll choices involve a great deal of overlap, making the results confusing. For instance, I am using Magpul sling and mounts, but in a manner not contemplated by the poll - paraclip with three attachment points, but the rear most is a QD socket with a QD swivel in place for the paraclip to attach to. I fall in three different categories in the poll.