Have you considered joining those parts into a single file? It’s a fairly straight-forward process using MKVToolNixGUI:
The guide specifically describes using it to join multi-part movies, but the same process applies to TV shows as well.
You can keep your originals squirreled away somewhere and just use the combined whole as the media for your library.
I understand what your original request was, but this may be a better solution in the short-term to have the media correctly added to your library.
