No, you're not SOL, what we'll do is that we'll get one ordered and we'll add support for it.
It might take a little time for us to get support added, but we'll get it done.
Apart from locks, thermostats are some of the most complex devices when it comes to adding support for them due to the many variables and although we have support for thermostats, it clearly doesn't work with all models as you've sadly experienced. One of our developers has a TZEMT400BB3NX which apparently works, so it's strange that your one doesn't work, as they don't appear that different.