Oregano seems pretty popular with wasps along with Parsley ( Apiaceae ). Possibly others in the mint family such as Basil, Perilla ( Shisho) etc.
Chia might be another, seed is available Chia seed, not too expensive. Seems to germinate better with rain than irrigation.
Buckwheat is another possibility, unhulled kernels will grow.
You may consider other sprout seeds, relatively inexpensive. Red Clover etc.
Local native species would also be worth investigating, plants that can substitute for those above and promote local beneficials.
edit Salvias worth looking at, may be local species.