Well there is this thread Whonix for arm64 / Raspberry Pi (RPi) - #17 by Algernon where it’s easy and fun for me to work with @Algernon. Clever questions being asked, and clean pull requests being submitted. Exemplary. I didn’t try it myself and I am glad someone else maintains it. That also gave the Whonix project better Whonix-Gateway CLI support on the way. Why not read that thread, try out @Algernon’s work and see how it works? That thread should be a good start to see where we are now. Other than that I don’t really know what’s missing. I welcome any work on it since it gets more eyes on Whonix build script and everything. Helps to streamline, clean up, etc.
Part of the work is upstream related.
Do you think you could finish this pull request work?
Do you think you could implement the following in grml-debootstrap?
Not really sure I understood your question and answered it.