At the seder I attended, there were lots of kids and not nearly as many adults. So we only let one of them say mahnishtanna because we didn’t want to sit through a thousand garbled yiddish translations.
To make it up to the others who were left out, we hid extra afikomans – enough for all the kids there to find at least one. There was only one matza to hide, but plenty of hard boiled eggs (we make them for shulchanaruch anyway). And to make sure none of the kids cheated by taking an egg out of the fridge and pretending it was a hidden one, we colored the eggs with food coloring before we hid them. Everyone who found one got a prize.
My neighbor liked the idea so much, he did the same thing in his backyard after Shabbos.