I guess the easiest option would be to purchase an identical replacement so it will just 'drop in'.
Also worth getting in touch with Auber I think and explain what's happened. A reputable company would surely try to assist given the 'infant mortality' nature of the failure.
Full on commercial/industrial grade controllers with similar functionality to the Auber will cost considerably more and as you've hinted at, will probably require setting up from scratch, and maybe even different configuration with respect to wiring/connections.
The cheap and cheerful Chinese units are a bit of a gamble, quite apart from simpler operation, you will most likely have to come up with an alternative Steam Generation strategy. Not that difficult to do but would require specialist knowledge, qualifications and licensing to be legal....
You could always revert the Steam option back to the T/stat, if you still have it?