Rinse kidney beans under cool water until runoff is clear and foam-free.
Drain 2 minutes, spread over a clean towel, blot gently and stand 5 minutes.
Dice celery, bell pepper and pickles; blot pickles, then slice scallions and chop parsley.
Whisk yogurt, mayonnaise, vinegar, Dijon, honey, celery seed, garlic powder, salt and pepper until smooth.
Fold celery, bell pepper, pickles, scallions and parsley into the dressing.
Add dry beans and fold six to eight times with a broad spatula.
Cover and refrigerate for 30 minutes.
Taste a bean with pickle and pepper; add vinegar by the teaspoon or salt by a small pinch if needed.