Put the eggs in a large pot and cover with cold water. Bring to a boil, then reduce the heat to medium low and simmer 10 minutes. Drain, then run under cold water to cool slightly. Peel the eggs, halve lengthwise and scoop out the yolks into a food processor.
Add the mayonnaise, sour cream, mustard, soy sauce, lemon juice and a pinch of salt to the yolks in the food processor and pulse until smooth. Add the crab and pulse a few times to combine. Season with salt. Transfer the yolk mixture to a piping bag fitted with a wide round tip. Pipe the mixture into the egg white halves. Refrigerate until ready to serve. Top with wonton strips and sliced scallions.