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So what if lelouch created Saz and became the massacre princess/prince instead of Euphemia. In this world zero would be Suzaku and lelouch would still be a prince. Another thing that happened is after Marianne died, Charles will comfort Lelouch, making him be loyal to Britannia. Charles would send lelouch to Japan for safety and pick him up before the war starts. Later in life lelouch would become the Viceroy of area 11 after Clovis death. Then reconnect with Suzaku and create SAZ so they can be friends again.
I think this lelouch would be more innocent and naive or similar to Euphemia, since I imagine that this world Charles would be more protective of lelouch.