What would you plant to cover this wall?

Ideas ho help a friend please…..
there is a narrow border at the bottom of this wall on the left side and terrace on the left. Not possible to add trellis or attachments to the wall in any way….. how can we make it more appealing? Oh and it’s in France so generally a few degrees warmer than the UK. Nice soil, but full sun all day.
there is a narrow border at the bottom of this wall on the left side and terrace on the left. Not possible to add trellis or attachments to the wall in any way….. how can we make it more appealing? Oh and it’s in France so generally a few degrees warmer than the UK. Nice soil, but full sun all day.

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What about a trellis a couple of feet or so away from it so that you could get behind it if necessary
Then shrubs and small trees in front, with a gap for any maintenance, for the wall and the planting.
Long term: Montana, hops or roses up the strings? Or create a string crossing lattice from the roof, diagonally, pegging into the ground? Could be an interesting project.