Okay, nix the gauge swatch then (I don't always do one either), but the great thing about crochet--and especially a crocheted edging--is that you can easily and fairly painlessly rip it out.
It looks like you will be working the edging into the cast on edge (after you've knit the rest of the sock), so pulling out and redoing just the crocheted edging will be much easier than redoing, say, a knitted edging--or a knitted anything for that matter. Only one live stitch to keep track of when ripping back in crochet. It definitely has its plus sides!
I will add this note just in case it helps: Make sure your cast on stitches are loose enough to insert the recommended size crochet hook through them! There's nothing more annoying than trying to force a hook through really really tight stitches--makes the whole finishing up bit unfun indeed!