For the nerd in you, how about this: crochet lightsabres?
They’re from The Sparkly Toad and are all UK htr! Nice and easy, and doable in front of the telly. You’ll need some cardboard tubes too, either loo rolls or kitchen rolls. These will keep your little Star Wars fans happy and allow them to whack each other all they like with no injuries. Plus, any breakages are replaceable in a jiffy!