Hi,
I totally got your point, but this system is meant to be used from the Earth perspective.
That said, you might want to have a look at the plugin code and at the Celestial Maths Blueprint function library included. There are functions to compute the Moon location in heliocentric space, same as for the Earth, using VSOP87 functions.
That way, you might be able to load the RA,DEC of the star catalog, and convert them to other coordinate systems. I’m not saying this is easy, but it could be an approach if you’re not afraid of Math.
I have no plan to have the system working from any perspective of the solar system, it’s not such a frequent case.
But Maybe the NASA DUST Tool would help you better…