Add hook to allow alerting redirect response issued for authorization code grant flow

I've got a use case where I need to be able to alter the redirect response issued by the simple_oauth_extras module as part of an authorization grant flow. I would like to append additional query string parameters to the callback URL depending on application context. For example adding &new_user=1 if the user is authorizing an account they just created vs using an existing account.

example.com/?code=asdf123...&scope={}...&new_user=1

In order to do this in a generic way I've added a hook_simple_oauth_extras_redirect_alter() which then allows me to customize the redirect in my own custom module. Example:

function lehub_simple_oauth_extras_redirect_alter(\Drupal\Core\Routing\TrustedRedirectResponse $redirectResponse) {
  $is_new = // .. some logic to figure this out ...

  if ($is_new === TRUE) {
    $redirectResponse->setTrustedTargetUrl($redirectResponse->getTargetUrl() . '&new_user=1');
  }
}

Honestly, I'm not sure if this is the best way to go about this. Or if it's even a good idea. But ... it's working for me so figured I would share the code in-case it's a useful addition.