We’re on the same page! I’ve got lots of brain storming. But I did see a thread where a guy build a different motor to power the Dillon dies that was really slim.I'm thinking a "sky hook" over the press and a cord with the drill hanging off, engaging the hex drive on the trim die, would carry the weight of the drill/dremmel.
Of course you'd need a swivel in the cord to keep it from winding-up while the turret turns, and a "dog" on the trim die up to the drill to keep it from spinning when running.
The drill could be left running rather than on/off when a case is in it.
Seriously, it could look like a Shepard's Hook