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In the vein of dbr's question, can you replace the 'window keep' with a double ?
http://www.double-glazing-parts-repairs.co.uk/universal-window-keep-erkunim
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I have down this. Albeit, I replaced old vents and didn’t have to drill holes for air to pass through. It was easy enough. If you have to drill you don’t have to be too tidy, the vent will cover any small errors. The bigger concern was working on a ladder as it takes a bit of precision drilling the holes to fit the vent covers.
Anyone retrofitted trickle vents?
https://youtu.be/DlGoG2CdLAk
Is it one of those things that will turn out to be an absolute cunt of a job despite the simplicity of the YT video?