There is a simple answer to this, nothing, even if you can get past gulley with out saving, the game recognizes that you have no vanes so its simply just says the same thing in lorule if you try to warp without vane " Please activate a vane before trying to warp"
If you want an index warp kind of deal, we need to skip the first vane and activate a hidden vane that is oob or basically a vane that shouldn't be in normal reach to be able and even then it probably won't work anyways since it most likely they made it not work or not even in the game itself, sorry lol