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We have internal film on our windows (lower reflection value / lower mirror) and they work wonders. You'd definitely need external though as too much heat would be captured by the dark tint before being reflected by internal film.
With that level of reduction and the thermal barrier of the glass, I think it would completely solve the issue. Might as well give it a go...!
How about some of this?
Sticks to the outside rather than the inside so not affected by the tint.