If you use the zip ties and trim them, make sure you get the end trimmed flush. I've seen these trimmed haphazard and they can tear flesh and ripstop. Be diligent and they should work, however I'd get original replacements. How much did that kite cost you? Cheap repairs and result in expensive fixes.
Not my humble opinion, I don't have any humble ones!
Yup, I agree, zip ties, if left with a sharp edge can cause a nice gash in your body or kite.