Yes, I am planning on trying out the Diatemateous Earth and Garlic/pepper spray, since we are supposed to have a few rain-free days in a row.
Throw in a couple of drops of dishwasher liquid (Dawn) soap as it will act as a surfactant (allow Diatomacious Earth to spread and stick) on the leaves.
You will probably have to reapply after a moderate , to a heavy rain.
I also like the idea of a "trap crop" of radishes, myself.
If the radishes get to harvest, its a bonus/ if not harvestible, the flea beetles leave your main crop alone.