Converting battlecruisers into fast troop transports

Could battlecruiser hulls discarded after the Washington Naval Treaty become fast troop transports?

Yes, but commercial liners offer fast transport without requiring the Navy to pay for their upkeep throughout peacetime.

The proposal considers Admiral-class hulls and the disarmed Courageous and Glorious as possible fast troop transports. Their speed could make the conversion useful. The counterargument is financial: commercial liners can supply transport capacity while earning their keep outside naval service. Converting a warship would leave the Navy paying for maintenance in the years before it needed the transport. Technical feasibility alone therefore does not make the conversion economical.