pic:
GG Gorgon is surprisingly doable (though with some farmed piety and in a normal dungeon that's to be expected). Poison is only applied at the end of an attack, so if you kill the monster with only one melee hit (and Binlor could provide a lot of tools for this) you won't anger GG. Plus you can always target Undead creatures. On a map with more Undeads this could be a very good combination.
With Yendor and Stone Sigil I was able to get a quick Enlightenment and saw no reason to convert back to Binlor. It's probably doable in harder dungeons as well, just farm a bit, set up a perfect high-level kill, convert to GG, get Humility and use Cleansing/Protection to aggressively level up, kill all the undead and convert out. 1 or 2 piety hit wouldn't be too serious either.
