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These things look like they'll work:
https://www.blocblinds.co.uk/window_blinds/blocout_infoSeems pretty dark in the video. Assume they'll fail to work as soon as the first bike tyre hits it though...
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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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We have these https://www.johnlewis.com/house-by-john-lewis-blackout-roller-blind-white/white/p3198140
Plus curtains.It’s pretty dark.
still makes a big difference, still allows some light through. is the goal total blackout?