Dear Dr Youssef,
Thank you for this information! Yes, I know of this book of Matta al-Miskin. It is interesting that Eastern Orthodox sources have become influential among the Coptic Orthodox. I presume this is a 20th-century development, connected to the monastic revival in Egypt.
In response to my own question, I have done some further research, and it turns out that there is quite a lot of Russian Orthodox material translated into Arabic and published in Lebanon.
Sasha