Nope. All you can do at this point is use SMS forwarding. Just be aware that forwarding will count against your messaging bundle or, if you don't have one, you'll be billed for incoming and outgoing messages.
SMS forwarding isn't quite so straightforward either as messages come from and are sent to numbers used by Google. I'm not sure how you'd initiate a conversation with forwarding since you need the phone number that was assigned to the contact that sent you a message. Unless the person sends you a text with GV SMS forwarding enabled you won't know what number to use.