So I completely accidently killed Cursor Lucullus before I could do the quest "Render Unto Caesar" and "Wild Card: Change in Managament". Can anyone tell me either how to select him to use the cheat "resurrect" or how I can get around it?

Load a save from before this happened? That's how I'd do it. Alternatively, just roll with it. You can just select the raft, you know.

If you must resurrect him, then you're gonna have to both bring him back to life and reset his quests, which The Vault can help you with.

-Nukeknockout

Um... reload? If your one of the kind of guys that only quicksaves, then too bad i guess, though you should keep at least 2 saves of one game (quicksave and regular save). If you really must, you could ressurect him, but it would reset hes speech options and in that case reset his quests. Or if you dont know what to do, you could just go with it.

The only way I could imagine someone accidentally killing him is when that someone is attacking Cottonwood Cove, which means that said someone is not aligned with the Legion. You don't need him for the Wild Card quests and I'm not completely certain if you even need him for the Render unto Caesar quests. I could be wrong, but I think the only reason why he's there is because the Legion needs someone to guard the only current way to get to the Fort. You can just select the raft and you'll be sent to the Fort.