Could swapping saucer sections change a Galaxy ship's role?

Could Starfleet swap Galaxy-class saucer sections to convert rapidly from science to war?

There is no clear official provision for a whole-saucer swap; internal reconfiguration is the more plausible route to changing the ship's role.

The audience asks whether Starfleet could move quickly from a scientific fit to a war fit by replacing the Galaxy class's saucer section. There is no known official provision for exchanging the whole saucer. A less spectacular explanation is that the Federation's industrial wealth lets it build richly equipped ships whose internal spaces can be reassigned. This separates the canonical separation feature from the broader inference about laboratories, accommodation, and latent combat volume.