Internally you can classify it as a type of mod. However, for UI, maybe an extra button that will show DLC? Because some people may have no issue with DLC, but is completely agast about mods.
Not sure how your system determines if a craft is Stock or DLC, TBH.
I went for having craft classed as Stock, Stock+, Mod and Mod+, and there's options in the filters to exclude DLC craft or just show craft that use the DLC.
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