If you train the shoots of the [Blauregen] on the wire, you also don't have to cut anything. They are still quite flexible up to a length of about 2m. This is done in a few minutes while passing by.
Do you want to green the corner directly or the side wall on some surface?
More the side wall and also a bit beyond the downpipe. It doesn’t have to be significantly higher than the basement. To me, it’s too bare at the moment and the monotonous surface makes the house look quite massive. Clematis with a trellis could work since I can clearly define the area for growth. But I’m really not a professional.
I also find clematis pretty. But I know them more with the flowers mostly at the top and the branches rather bare...
What about espalier fruit? Kiwi or fig? What temperatures do you have over there?
Or a vine?