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https://www.asec.co.uk/asec-1591-asec-concealed-locking-window-restrictor-kit.html
I'd try these before going with the face fixed cables.
Those cable restrictors are effective but well ugly. Hence they are usually only found on hotels where liability trumps aesthetics.
What type of window are you trying to secure, as there's other options depending on the style of opening
Tilt and turn
Outward opening casement