I would ride up the side (shoulder) and cross/turn with a left-turning car. Hang back so that if the car surprises you and turns right, he doesnt right hook you. make your own left turn wide so that there is plenty of room between you and that car. You won't slow anyone down, as you won't be in front of anyone. I wouldn't want to inch forward between cars and risk getting accordioned. If a driver complains that you're jumping the queue, explain you don't want to slow down traffic by taking up a "turn" at the stop sign. Technically, you are crossing at the intersection (like a pedestrian) and then resuming riding along the road.