Here’s a setup for the new Gala Reborn Jeanne and auto-shapeshift in Auto Expert Tartarus. This is pretty consistent with 3 Fafnirs, tested at 45/55 runs cleared (82%). Adding a 4th Faf can be done but drops clear rate to be not really worthwhile. Removing all Fafs makes this a super consistent auto run on its own too.
Hilde can be replaced for G!Zena for slightly lower clear rate (Grace deaths = most likely reset).
H!Elly and H!Vanessa are workable replacements to Julietta.
Without Reborn Jeanne, you can run regular Jeanne or Liger on GEuden, and Thor on Juli.