Since cell phone companies only offer call forwarding, and not SMS forwarding services, I spent less than an hour in Tasker (link to play store app here) to create not only a forwarder, but also allowed responses to be sent back.
I have cell service in both the phone and the watch (two different phone numbers), which allows this to work.
The easy part was forwarding all received text messages to the watch phone number.
I then created an event that upon any text received from the watch’s phone number would start. It takes the text received, splits it into two parts, (phone number of recipient and body of text) and sends the text via the phone to the recipient. This allows me to respond to texts and the receiver does not know that I am utilizing the watch with a different phone number to reply.
If anyone is interested in this, let me know. I might be able to make an .apk with the Tasker app factory.