Next time contact DT directly. They might ignore you entirely. They might respond to a customer who has clearly done his homework. My experience has been that custom drillings are not that hard to get. Or they can supply undrilled which leaves them clear of liability. All depends on who takes the call.

My main concern would be the hub flanges are not up to tandem duty with only 24 spokes. DT could tell you more about that.

In the collection here I have 24 hole no-Record Campy, 24 hole Maillard 700, 24 hole Normandy from 1950s. None of that would be useful to you. Pretty sure none of it was ever in a catalog.