When we consider this together with the Ethiopian Orthodox inclusion of the book in their canon, there is no doubt that 1 Enoch can be considered deuterocanonical (but I do think we should read it as the Ethiopians do, that is to say, defer to prevailing doctrine where the text appears to differ, due to the possibility of textual corruption).
We also really need to lose the idea that the Old Testament only has 22 books. The canon adopted for the Masoretic text was the basis of Rabinnical Jewish theology that postdated the resurrection of Christ, the evangelization of the nations by the Apostles, the destruction of the Temple, and later of most of Jerusalem following the failed revolt of the Jews in 130 AD, and other substantial events, as well as the schism between the early Christians and those Jews who did not accept Christ (it should always be remembered that many did; if you look at the membership of the various Christian denominations in the Middle East, you will find many people with Jewish last names or derivatives of Jewish last names, who believe they are descended from Jewish converts to the early Church).
This canon is of course entirely a legitimate work of Jewish theology, and is of interest to Christianity, just as the works of Josephus the great historian, Maimonides, a Yemeni Jew who was possibly the greatest philosopher of his era (truly formidable given the competiton in the form of brilliant Islamic philosophers such as Averroes, Avicenna, Al-Kwarizmi, and many others), the era immediately prior to the pre-Renaissance philosophical breakthrough in Christianity with Thomas Aquinas and Gregory of Palamas, and numerous other Jewish scholars and theologians, most recently the Karaite scholar Nehemiah Gordon.
However, given that the early Church did not use it, and neither did the 22 book Masoretic canon bind the liturgical traditions of the Anglicans, the various Roman Catholic liturgical rites, the Eastern Orthodox, and all of the Oriental Orthodox with the possible exception of the Syriac Orthodox (the Old Testament is not heavily used in Syriac Orthodox liturgy, and there are different variants of the Peshitta, which have different books), and given that even from a Sola Scriptura perspective there seem to be compelling references in the New Testament to these deuterocanonical or apocryphal Old Testament works, we ought to avail ourselves of them to the fullest extent possible, that being, that we do not read them in a manner that contradicts the existing doctrines of Catholic, by which I mean universal and normative, Christianity.