Take your last few stitches (4 maybe) and knit I-cord for a few cm, then cast off and sew onto the spot right next to the starting point of the I-cord, using the tail for sewing.
you can also start from your last stitch:
with that stitch as a base, make 10-15 stitches, using knit-cast on. Then either knit one row or just cast off straight away again. Sew the open end of that loop down (I might loop the last stitch of the cast on through the edge again before knitting back or casting off, so that there is no sewing and a stronger connection.
No crochet, still a loop holder. Anything appealing for you?
PS: I could not master getting along without crochet