Impossible
No way to defend all 3 confluxes on your own, maybe it's possibile, but i wont believe it unless I see a video
But the 2 things that make it impossibile is you can't get through the maze solo, the exit is blocked
And as soon as Atheon teleporting you to Mars or Venus you're dead because there's no one to open the portal to get out.
English
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Theres a video somewhere that a defender titan solo'd confluxes with touch of malice blessings combo. He just sat inside the crevice of the right pillar (next to middle conflux) to guard all three confluxes. Sightlines were quite nice.