Hope this helps someone!
I created this handler as I could find similar TKB devices here but not this exact one - and none of the similar devices worked.
It’s a simple enough device and based it on the in built Smartthings Z-Wave Switch Secure handler. I’ve hardcoded that when on it reports power every 25s, and every 30min when off. If anyone needs to be able to change these settings I can update the handler so that these are customisable through settings.