Do you think Toyota does not know about API CJ or CK ratings?
In your Fortuner manual the recommended oil is either API CF/CF-4 or ACEA B1/B3/B4/B5.
Also, do keep in mind that API Diesel oil ratings are not always backward compatible. So it is not the case that API CK oil is always better than API CF.
In my personal opinion, you are actually worried about the cost. In my opinion, Shell Helix HX 7 (blue bottle) 5W-30 oil is better than any diesel specific oil available on the market for your new Fortuner. It's specs match exactly the Toyota recommendation. Also, it is not very costly.
Also, if you observe the blue bottle carefully, it actually mentions "FOR DIESEL AND GASOLINE ENGINES."
The "Diesel" comes first. So it is a "diesel oriented oil", if that comforts you.