I found the Indonesian Copy of this movie

There's more Cast and Crew on the credit of this version
The video itself in low quality, but i try my best to write the Indonesian Cast and Crew based on this version (a few of them unreadable, so i skip a few of them)

Black Belt Karate
Indonesian Title: Karate Sabuk Hitam

Cast:
Toto Soegianto (as Ramos, or in Mandarin Version: Lamoz)
Lee Chin Kun (as Tommy)
Deasy Surachman (as Dewi, or in Mandarin Version: Tan-Wei, Teacher's Daughter)
Willy Dozan (It's Billy Chong, as Yanto
In Indonesian Version, he only one of the Yanto's Student, but in Mandarin Version, he's the Yanto's/Teacher Son)
R.D. Mochtar (Setyo, Head of "Perguruan Elang Emas", or in Mandarin Version called as "Golden Eagle Military School")
Soeyitno


Heru Sutanto
Kies Slamet
David Sembel
Simon Sudarso
Niniek

Guest Star: Lo Lieh, Bruce Leung Siu-Lung

Lighting: Abdulrahman Ismail, Denny, Donky, Gani, Anwar

Makeup: Asep Suparman

Art Director: Yasim Kalu

Property: Dharmono. S

Set Decor (or just "Set" ?): Arifin

Juru Foto (I guess it's "still"): Yunus Muliawan

Martial Arts Director: Lee Chin Kun, David Sembel

Laboratory: Hong Kong Color Movielab Ltd.

Unit Manager: Hasan Wijaya

Assisten Unit (Unit Assisten or something): Umirto Sugiharto

Production Manager: Djohan B.A.

Director: Wisjnu Mouradhy

Credit Images:
https://drive.google.com/folderview?id= ... 8yXlAJoZ6_

*note:
Additional data
According on this site:
- https://www.indonesianfilmcenter.com/fi ... abuk-hitam
- https://onesearch.id/Record/IOS1.INLIS0 ... 19/Details

This movie movie produced by PT. Cinerama Film
Producer: Adji Aswin
Sound Director: E. Sambas, Sutarno, Sutarya
Editor: Mulyadi

Additional Cast:
Innawati Cynthia
Maswod Azham
In this site, David Sembel called as "David Gembel"