I have the entire ACC series at home. They give excerpts from St. Severus of Antioch's Cathedral Homilies as well.
I've spoken to a number of scholars on the subject of your inquiry given that I hope to be able to release a surprise publication with the help of a few friends, within the next few years hopefully.
It appears that there is a wealth of commentaries that exist in extant manuscripts in museums and libraries all over the world. Many of these have been edited; however, such editions have been published either in their original language (Syriac, Coptic, Arabic, Armenian etc.) or in french or german translations. Nevertheless, there have been a few that have made it into english, such as for example, St. Philoxenus of Mabbug's Commentary on Matthew and Luke (Corpus Scriptorum Christianorum Orientalium 171-2 (vol. 172 is the translation), 1978), edited and translated by J.W. Watt. This is not a translation of the entire commentary however, since only fragments of that one survive in the first place. Additionally, Prof. Michael Papazian has edited and translated St. Step'annos Siwnec'i's Commentary on the Four Gospels (St. Step'annos is a great Armenian Orthodox Saint of the 7th-8th century). From my correspondence with a certain Armenian Orthodox scholar, it seems that this english edition is currently in press and is hence due for release very soon.