What if he got to experiment on a launched SoDak(so incomplete, but with torpedo protection and maybe deck armor)? Would a successful trial be more convincing than an old dreadnought?
I like this idea, but let's do it right. In addition to bombing trials to test how effective the bombs are against the ships, let's try out the other parts of the kill chain. Specifically, verify how well aircraft can find ships and how well can they hit them.
Have the USN provide a radio controlled target battleship and see how well bombers do trying to hit it. I expect this will embarrass the Army Air Corps and the Navy VP squadrons because I think they will both have big problems with level bombers trying to hit moving ships. Have the carriers try as well with light bombs and exercise torpedoes. They will probably do better.
As for search exercises, I think this was a big part of the Fleet Problems and the Army tried as well. IIRC the Army was quite happy about finding an Italian liner 700 miles off the East Coast in the 30s.
Either way, some real exercises could get the services thinking. Imagine WW2 if the US started with the anti-shipping know-how that the USN and USAAF had acquired the hard way by 43-44.