Turn her into a carrier maybe?
Blech.
Source: US Navy; specifically,.
https://www.history.navy.mil/conten...hhc-series/nh-series/NH-103000/NH-103738.html
HMS Agincourt. (British Battleship, 1914) Drawing prepared by the Office of Naval Intelligence to show the ship's general arrangement in 1914-1916, after removal of boat stowage structure spanning the amidships gun turrets and before elimination of her tripod mainmast. It features a waterline outboard profile, topside plan and interior plans showing arrangement of armor plating. U.S. Naval History and Heritage Command Photograph.
Some comments.
The fire rooms and the trunking for the stacks are awkwardly placed in the DN and would require fairly massive intrusion into hanger space right where that hanger space and the lifts should be as wide as possible for moving airplanes around in the British strike below and arm/fuel practices of the 1920s and 1930s.
Based on a similar hull plan (HMS Furious) the forward edge of the flight deck would be set well back from the stem leaving an exposed forecastle and a dangerous wind baffle and stall hazard at launch.
HMS Agincourt is too slow to be of much use past 1942 when wind over deck becomes a necessity for the heavy FAA monoplanes coming into service. USN aircraft are viable since a 19 knot/10 m/s) flyoff for such burdened birds is a specific USN requirement.
As to the hanger capacity? I'm thinking something like HMS Hermes. (20 aircraft) with that bodged barbette layout eating up so much hull volume and making for a wasp waisted hanger in addition to the side trunking fore and aft for the exhaust funnels for the widely separated fire rooms.
Convert her in to a mobile naval base......since nobody has suggested it, strip out all but the front two mounts and turn the rest into a fast (for the time) depot ship?
I like the idea of an AOE much better than a mobile base. No sense in letting that otherwise horribly designed DN hull go to waste when it can be used as a auxiliary oiler and explosives ship and then as a target after it is worn out.