The variable is not only used in .med and .sub files, also used in .stp file. There is no easy way to do these refactoring thing as modern code editor like vs code. Besides refactoring, we also need other features like OOP, data structure and version control. It is really hard to write the code, in which all the data stored in array. This is why we control STAR directly with python or C#, and this can help to write much more complex code.
Actually Hamilton should do more works to venus, which I think are not hard in current time. I also do some work to add version control, C# script and 3D simulation run