Go hire some ringers. As you and your director know they’re great fun to sing. Your choir will love you for sharing the fun.
But for festal postludes forget the Franc or Widor, my favorite is the Gigout Grand Choeur Dialogue. Back at St Thomas Church on Fifth Avenue in New York, Gere and Judy Hancock would play it as an actual duet with one at the main organ and the other at the antiphonal organ over the narthex. Great fun! I think there’s another recording of it from St Thomas Church in which they (not sure it’s the Hancock’s) gilded the lily by adding a trumpet.
There’s a video of the Gigout on YouTube. Unfortunately I’m traveling and don’t know how to insert it using my iPhone.