That’s actually a fascinating idea. All interstellar travel is based on the movements of the planets through space time. I bet it alternates between being technically faster and slower than FTL travel since you may have to wait for a time when your destination to pass into the planets past location.
Wow that’s a fun thought hole. Constraint certainly breeds creativity!
Still have mine in the hard plastic case, such a neat piece of electronic history. Also a giant PoS, more screen door than a Lowes.