Daniel Mikusa proposes to try: https://github.com/paketo-buildpacks/libpak-tools/?tab=readme-ov-file#libpak-tools-package-bundle as they're moving the tooling out of libpak into its own project, with a single binary (multi-command) and we'll eventually be publishing binaries there. The tool includes what was create-package but it also has everything all in one command to compile, assemble, and containerize a buildpack/extension. That's the link above.
Test cases
To be done on a RHEL9 VM to validate the tools to be used and requirements/issues