Morose- bubba meises. First off, rav Elyashiv didn’t say a word about cooking so you are extrapolating. Second, I know and you know that no Halacha requires an unmarried man to buy takeout every night or have someone elses wife serve him. Third, if you want to say he may cook for himslef but not a family, I know and you know that no Halacha requires a widower or a divorcee with children to buy takeout every night or to have someone elses wife serve them. Fourth, lo silbash only applies if it applies to all men, and clearly cooking doesn’t fit the bill.
Stick to just harrassung wolf, which is what you’re good at.