I have machine "tied" quilts before. On a baby quilt for a little girl I used bows. I have used other decorative stitches and bar tacks also. If you can set your machine to sew just one repeat of a pattern it is really quick. As long as you can pin baste your quilt, you should be able to tack it even if you have already done the binding. I have had to do that when repairing quilts that had been tied. Good luck.
Pat