I ordered an ETA 2893-2 movement. This has a 24 hour hand in addition to the regular "3 hands" plus date of the ETA 2982-2. It is the same diameter as the ETA 2824-2 that I use in my Ka La watches and it "should" fit into the case. As an experiment, we will see if this is the case or not.
I have designed a dial to make use of its 24 hour capability. The hands are a bit provisional in the render below. The idea will be to use lots of lume or perhaps Trigalights (tritium gas tubes).