As I live in Asia, there is a lot of Hindu and chinese.
The massael of Ayatullah sistani about the najassat of kaafir is ehteyat so we can take the massael of another ayatulah. I heard that for Ayatullah Makerem Shirazi, kafir are najiss from heart but not from the body, so its not najis if they touched us or the food

I can follow this ayatullah for this massael?

What you said is not correct.
Ayatullah Makarem says kafer is najiss as fatwa.