What are you trying to accomplish specifically with redoing the party and/or save editing? If it is just changing the CEO you ended up meeting, you can do that with current save editors. I used this one:
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Use the drop down to select your character "PC" (I don't think it is needed, but doesn't hurt), then go to the Flags tab and Ctrl+F search for "CEO". You'll see two relevant entries:
DHAAL_PARTY_CEOGIFT
DHAAL_PARTY_ CEOMET
They both get assigned the same integer depending on which CEO you got in the end, either 1, 2, or 3. I think 1 was Paragon the war robot one, 2 was Brightwater the bio-mutation one, and 3 was Utopian Skies the VR sex one. Not 100% sure on which is which though, sorry if I'm off. But yeah, just change those two variables to whichever CEO you want to have met at the party, and you should be good to go. I made a save right before fighting the boss of the dungeon, and it changes accordingly even modifying those variables that late in the dungeon.