If the kit is that good otherwise, I would also not recommend to convert it back to a 1939 fit. The superstructure changes are significant. You would also have to remove the funnel cap (added in 1940).

I would rather focus to fix the few issues with the 1942 fit, e.g. the radar antenna. I have not found views of the radar antenna of the kit to know what the issues are.

The after superstructure with the additional AA guns were added between 30 April and 25 July 1942. The radars on the upper platform of the foremast were added July/August 1942 - I have not found when exactly. But the ship was inactive most of August 1942 for repairs of the turbines. She first was deployed for exercises on 1 September. She certainly had the radars when scuttled - see Jacques' photo.