Place cabbage and radish in a large colander. Sprinkle liberally with salt and mix to combine. Set aside for 1 hour. Add additional salt, mix, and set aside 1 hour more. Rinse cabbage and let drain. Meanwhile, combine garlic, onion, ginger, and rice vinegar in a blender. Add water and blend aromatic mixture on high power. Transfer drained cabbage to a large bowl and add aromatic mixture. Add persimmon, cucumber, green onions, and red pepper flakes and mix well. Transfer kimchi to airtight containers and refrigerate for 3 days.