I read the discussion above and felt it didn't give a full picture of what strings are, or may be, needed for this style of bass.
Short-scale Hofner Violin and Club basses, and copies there of, often require medium scale strings to allow for the distance from floating bridge to trapeze tailpiece.
Maybe that's not an issue on the Harley Benton Violin bass, I don't know for sure. But the OP deserves to hear all the possibilities.