Of course, there's a rather obvious problem with using superheroes in real world Japanese media as a model, here.
That being that the DCU isn't an anime/Tokusatsu universe.
It's a world where real superpowered beings already exist, and don't exist under the rather restricted rules that exist in, say, the Super Sentai multiverse.
In a world where superheroes are a real presence, rather than a relatively minor aspect of US pop culture, superheroics in Japan would develop very differently than the pop culture depiction of same did in the real world.
When Superman's in the news every day, when the only reason Green Lantern wasn't instrumental with the Allies winning WWII was because the Germans had a magic weapon which counteracted the American heroes... When a certain percentage of your own people can fly or freeze people with a thought, just because they got stuck in the supermarket cooler one night... Henshin teams are not going to be that common compared to the cape and cowl crowd.
Given a larger look at the Japanese heroic community, I'd expect to see more heroes that fit in with what we see in anime, manga, and tokusatsu, but I would also expect to see teams like the SYT.