Are you only allowed to take a foam sword? If not, then you should just get an Ultrasaber.
I would recommend getting an ultrasaber with sound. Download the link/ legend of zelda font from here on the forum. Or ask me for a copy.
Then get a ripper blade!
https://ripperblades.net/products/master-sword-ripper-blade-rtsmasterripperI like your idea of a jedi link! I hope it works out for you. Post some pictures if it does and welcome to the forum.
Here is an example of an acrylic blade with the Zelda font. Please forgive my homemade blade. They sell blanks if you wanted to make your own.
And the same font with an ultra edge blade. Incase you were wondering.