There is such a product, marketed by and for people who have no knowledge of the Halacha. Such ציצית are absolutely פסול because of the rule of תעשה ולא מן העשוי. Suppose you have a garment has three corners, and you attach ציצית to them, and then modify the garment so that it has a fourth corner. שלחן ערוך says clearly that you will need to untie the three ציצית which you had attached prior to the garment having had four corners, and put them on again (משנה ברורה points out that this means they must be completely untied).
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