THE SMART TRICK OF D&D MULTICLASS THAT NOBODY IS DISCUSSING

With that said, I'd personally go with Fighter like a primary class (since it's the Warforged fav' class). You may get potions and mend Ordinarily (unless you go Juggernaut afterwards) and if the Wizard in the get together get some fix spell, You do not need to have any level in Artificer.Aura of Life: Protection from strike point greatest reductio