My guess is no regular bank is going to do prepaid interest. Probably because no one would want this as it's a horrible idea. If you end up selling the car, totaling the car or paying the car off early you basically lose all that prepaid interest.
I'm sure there are niche banks that cater to this specific religion who have workarounds. Because you know we always have to find a way to out smart those all knowing all seeing ever powerful gods.
