The Vulcan race would find survival somewhat problematic if they could
only mate during the pon farr mating drive, so yes, they
can mate any damn time they want to.
The other component is the telepathic link with the mate, which is what initiates the cycle in the first place. Without that link, the mating cycle either never initiates, or is broken, as it was when the shock of apparently killing Kirk broke Spock's link with T'Pring (and a thousand slash fic stories were born...).