My experience with those breakaway fittings has been unsatisfactory. They break away too easily. I had to put a very small drop of superglue in them: they still pull apart, but not by themselves.

The shrink tubing became the strongest part of my lanyard! Not what I'd intended.

Now I lay the ends of the paracord together and sew them together with 3-4 stiches of very light cotton thread. Haven't had them come apart on their own, and I have tested that they will break when they should.