Typically wildflowers in an area are synonymous with weeds. They shouldn't have any trouble growing if you break the current grass monopoly even a little. Most people have a hard time getting them to NOT grow in their yard. I had good luck including Jerusalem artichokes (sunchokes) in my yard. They are HUGE when fully grown and you will basically need a flame thrower to get rid of them but the birds and bees love them. They also spread risomatically by sending out root runners, so they break up compacted soil. A combination of those and sunflowers would basically be a 2 meter tall flower bed. I don't think you would even need the cardboard.
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That is considered non-native here and it is very difficult to get rid of it.
The following links are in Slovak, but there are latin names of the plants.
- The list of invasive species in Slovakia: https://invaznedruhy.sopsr.sk/invazne-druhy-sr/invazne-druhy-rastlin-sr/
- Non-natives: https://invaznedruhy.sopsr.sk/nepovodne-invazne-sa-spravajuce-druhy-na-uzemi-sr/nepovodne-invazne-sa-spravajuce-druhy-rastlin/
- And EU list: https://invaznedruhy.sopsr.sk/invazne-druhy-eu/invazne-nepovodne-druhy-rastlin-vzbudzujuce-obavy-unie/
I have found a seed mix that appears to not have any invasive plants (site in German): https://www.bloomling.de/samen-maier/bio-nuetzlingsweide-summ-summ-wiese, and it is also available in my country.