iRule Redirect by IP?

You can use [HTTP::host]. Also, assuming all the sites have specific redirects, you can also use an "else" statement to send all traffic that doesn't match alphasite or betasite to https://our.production.website.com[HTTP::uri]. In short, anything that doesn't match any previous statement will be sent to the site provided by the last else statement.

So, this will be the last statement in your iRule:

} else { HTTP::respond 301 Location "https://our.production.website.com[HTTP::uri]\r\nStrict-Transport-Security: max-age=31536000" }