Yep, it has two positions for 24/28 tDoes it not have the same geometry as the Huret Eco? Those could handle a 28 tooth no bother as long as the jockey wheel cage was fitted in the correct hole. Many Eco's still going strong after all these years. But yes Shimano and Suntour were more sophisticated.
It will work.
That's the one! <he points and screams>