This tradition isn’t really required at all and some people even find it offensive. If you believe it would be well-received, I would simply invite her parents to dinner or something. I’m not sure why the man is expected to ask for the blessing alone anyway. Doesn’t it make more sense for the couple to ask together, so at least the father knows that the daughter want to get married too? I honestly think this weird tradition should be replaced with a celebratory meal, outing, or get-together where the couple asks their parents for their blessing as a team.