Within the article they mention that this issue is due, in a large part, to monoculture farming so, why not do as cities do with developers who need to provide a certain proportion of affordable housing in new developments and just require a portion of farms to be free growth land. I'm all for this initiative on top of that but pushing for better agricultural land usage would probably increase the efficiency of the land that's actively farmed and provide more evenly spread preserves. It's always easier to target businesses through penalization than individuals through incentivization.

Bees are pretty sensitive to various chemicals, I'm not convinced that the population decline isn't also due to urban chemical usages that we haven't discovered yet.