^No need for anachronisms like transwarp. ENT made it clear that instantaneous long-range subspace communication was possible if there were subspace relays in place. This explains the existing inconsistency between the TOS episodes where they were three weeks from getting a reply from Starfleet (presumably in regions where no relay was in range) and those where they could communicate instantaneously with Starfleet from a considerable distance.
So here you're looking for a solution to a problem that doesn't exist.
So here you're looking for a solution to a problem that doesn't exist.