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Get these and make sure they cover a bit around the window.
These are also the same stuff as the ones you linked too, all depends on window shape/size as to how well they will fit.
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@hippy I use these in a bay window (so similar situation in terms of no overlap). although there is visible light round the edges, the extent to which they let ambient light in is minimal. you can see that there is light outside, but unless you are particularly fussy, they're absolutely fine. They let it considerably less light than that (albeit shit) curtains they replaced.
These things look like they'll work:
https://www.blocblinds.co.uk/window_blinds/blocout_info
Seems pretty dark in the video. Assume they'll fail to work as soon as the first bike tyre hits it though...