Why HMS Swift needed sisters to become a capability

Would HMS Swift have been more useful as part of a class, and how might she be converted for convoy escort?

Yes; sister ships would make her a usable destroyer class, while an escort conversion could add several twin 4-inch mounts.

A single unusually large destroyer stood out without giving the Royal Navy a repeatable operating concept. A class of Swifts would provide the experience, spares and doctrine needed to use the design as a destroyer capability rather than an awkward one-off leader. If retained for convoy work, Swift would be rearmed rather than renamed. Multiple twin 4-inch mounts similar to later cruiser installations would turn the available hull into a heavily armed escort.