Hello
Something like the roller you’ve proposed is the first thing that came to my mind. But it must prevent the belt from sliping off, it can not interfere with the way Strida folds and the longer belt (another not typical part in already not typical bike) will be propably have to be custom-made (or maybe not).
I think the only thing I can do for now is to take the bike for test ride as it is and compare it to 3 speeded EVO. But I think that I like the lowest gear too much to give it up in a daily use.
PS.Will you recommend any Strida seller in Austria? I’ve shown Strida to my friends last week and they looked pretty interested. They both live in Austria, Salzburg.
Best regards.