Whisk honey, mustard, lemon juice, garlic, thyme, rosemary, basil, salt, and pepper together in a small bowl until well blended. Add tapioca starch and whisk until well combined. Let sit until mixture is thickened, at least 5 minutes.
Dip lamb chops in the mustard mixture and massage until fully coated.
Place chops in a single layer over the red wine and onion mixture in the slow cooker. Pour remaining mustard mixture on top.
Cover slow cooker and cook on Low until an instant-read thermometer inserted into the center of a chop reads at least 130 degrees F (54 degrees C), about 4 1/2 hours.