So, I discovered they just released this bundle, which includes 11 games previously Japan-only officially translated into English FOR THE FIRST TIME EVER. (not counting the messed up localized versions)
They actually even retranslated the original Downtown Nekketsu Monogatari, keeping all the original characters and dialog, including it alongside River City Ransom.
All those games now in official english versions:
Nekketsu Renegade Kunio-kun
Nekketsu High School Dodgeball Club
Downtown Nekketsu Story
Nekketsu High School Dodgeball Club - Soccer Story
Downtown Nekketsu March Super-Awesome Field Day!
Downtown Special Kunio-kun's Historical Period Drama!
Go-Go! Nekketsu Hockey Club Slip-and-Slide Madness
Surprise! Nekketsu New Records! The Distant Gold Medal
Nekketsu Fighting Legend
Kunio-kun's Nekketsu Soccer League
Nekketsu! Street Basketball All-Out Dunk Heroes
But much to my surprise, they are not releasing a PC version (Switch/PS4 only). Judging by this video it seems to be only a emulator running in the background... I wonder, would it be possible to extract the translated roms from the game?https://www.youtube.com/watch?v=jcyyXmDBXQw