I would keep the twins, make another pair even, and the 4xGZ for a buddy system.
Turn the Hippers into hybrids with 2x3x15cm, the USN designed a 10.000t one with 24 aircraft, good enough for me. They can scout for and search shipping until the free for all is declared.
If one gets sunk, it is not much of a loss.
I would suggest always asking the British about naval matters... the actual British officers of the time, not the forum kind.
"...the Director of Naval Construction's department apparently did prepare a sketch design for a cruiser-carrier in 1933, although no details of it have survived. It was
rejected by the board, at least in part because of the fear that other nations would follow suit. The hybrid would not only make an effective trade protection vessel, but, as Chatfield had mentioned, a good commerce raider as well, and the Admiralty did not want to give anyone ideas along that line."
A hybrid is both a bad warship and the best commerce raider.
But they do look good, very steampunky: