Just scrape out the loquat seeds and stuff with the simple chirashizushi. They make fashionable side dishes!
My friend gave me large-sized loquats from Awaji. You could also make bite-sized sushi with smaller fruit.
If you add some salt, with lightly salted cucumber, thinly sliced pickled daikon, or shiba-zuke (Kyoto style pickles) to the sushi rice, this will help bring out the sweetness of the fruit.
Enjoy Japanese food around the world.