Scott Hahn has recommend “The Prophecy of Isaiah” by J. Alec Motyer. The author is a Protestant and the book is not written on a popular level, but I don’t know of another, until Navarre comes out with theirs, hopefully soon.
The Little Rock Scripture study has a “study” on the Book of Isaiah. I am coordinator (not by choice) of this program in my parish and we did the study in 2003. The program comes with a commentary that you might find useful. The Christian Community Bible, Catholic Pastoral Edition, produced by the Claretians in the Phillippines has a good commentary as well. These might suffice until we have both the Navarre and the Scott Hahn commentary.
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