A couple of years ago I was also doing some cross-development with A68k, and I was missing a cross-platform blink counterpart. So I wrote a little toy linker in Python called "hunky" that mimics blink. The idea was that I could use A68k/hunky for cross development and A68k/blink natively on KS1.3.
Reading this thread reminded me of that little project, so I decided to put it
online.
Again, this is only a toy that just implements the bare minimum of functionality to link an executable. I am not actively working on it at the moment, but maybe it is of interest to someone.