How is transferring a leveled up and fully loaded char into a new world not cheating when using the creative menu to accomplish it is? If anything using the creative menu and debug tools is the best way to accomplish a non-cheaty transfer. Use the creative menus to transfer all your items, build your replica base, grant yourself the exp to level up to where you were. Then roll the clock forward to the day and time you were on in your original world. You'll still have the advantage of being in a world that hasn't been looted at all yet, but that is about the cleanest way I can think of the accomplish what you asked for.