Poised somewhere between Mozart and Weber, perhaps:
https://www.amazon.co.uk/Hummel-Mathilde-von-Guise-Op/dp/B00GPHAX2W/ref=tmm_msc_swatch_0?_encoding=UTF8&qid=&sr= (https://www.amazon.co.uk/Hummel-Mathilde-von-Guise-Op/dp/B00GPHAX2W/ref=tmm_msc_swatch_0?_encoding=UTF8&qid=&sr=)
Review here:
http://www.musicweb-international.com/classrev/2010/Nov10/hummel_94043.htm (http://www.musicweb-international.com/classrev/2010/Nov10/hummel_94043.htm)
I'm obviously exceedingly ignorant. I had no idea Hummel wrote operas!
I can only think of the one you mention (and even then I had only heard of it- during Hummel's lifetime its overture, his Op.100, seems to have gotten a reasonable number of performances if I'm reading right??...), but I am mistaken, there were apparently 15 (http://www.jnhummel.info/en/musicsongsandoperas.php) though not all have survived (at all or in full). Interesting...