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Ill get a photo for you when I get home, but I used this (it was the strongest/ least medical looking version I could see)
https://www.amazon.co.uk/gp/aw/d/B01MT7NA7BThe window frame is 125 x 225cm and the pole is as high /deep in the frame as it can be (to block light and allow the window to open under it). Not the most beautiful thing ever, but pretty un-noticable as we keep the outter curtians half drawn at this time of year anyway to keep the room cool.
Have you got a picture of this? I've been pondering something similar but haven't decided what to do yet. Cheers