I think there ought to be a way.
Not sure if there's a more elegant way, but look at
a) making a texture that's the u&v repeat of the image_map
b) making a texture where there's a u-strip of texture a, and the rest is clear
I think b might be accomplished with a function based pigment where you'd use
select() and abs (x [or y]) to switch between the image part and the clear part.
That's the best I can do off the top of my head without POV-Ray in front of me.
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