For my last project I used a crochet bind off. The shawl is knitted with a 4.5 mm circular needle and bound off with a 3.5 mm hook.
The pattern (Pineapple Delight by Larisa Valeeva) is knitted in two directions: provisional cast on and the lace knitted top down, then stitches picked up and the body knitted bottom up.
I worked 6 chains in between k2tog (with the hook too) on the border and two chains on the body edge. The k2tog is not done with a single crochet but with a slip stitch.
yarn: Garnstudio DROPS Lace and Toho beads, silverlined Aqua, size 8/0