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There’s no real evidence that Christians translated any significant portion of the LXX, now is there? They may have made revisions in the preservation effort, but hardly at the level of translation ala your initial bogus claim.

Bogus claim? Hardly.

From Wiki:

(After Torah)Further books were translated over the next two centuries. It is not altogether clear which was translated when, or where; some may even have been translated twice, into different versions, and then revised.[9] The quality and style of the different translators also varied considerably from book to book, from the literal to paraphrasing to interpretative. According to one assessment "the Pentateuch is reasonably well translated, but the rest of the books, especially the poetical books, are often very poorly done and even contain sheer absurdities".[10]

Modern scholarship holds that the LXX was written during the 3rd through 1st centuries BCE. But nearly all attempts at dating specific books, with the exception of the Pentateuch (early- to mid-3rd century BCE), are tentative and without consensus.[4]

The oldest manuscripts of the LXX include 2nd century BCE fragments of Leviticus and Deuteronomy (Rahlfs nos. 801, 819, and 957), and 1st century BCE fragments of Genesis, Exodus, Leviticus, Numbers, Deuteronomy, and the Minor Prophets (Rahlfs nos. 802, 803, 805, 848, 942, and 943). Relatively complete manuscripts of the LXX postdate the Hexaplar rescension and include the Codex Vaticanus and the Codex Sinaiticus of the 4th century and the Codex Alexandrinus of the 5th century.

The Prophets and Writings (Nevi'im and Ketuvi'im) were translated by anonymous authors at some later date. Over time the Septuagint became corrupt and Jews stopped using Greek translations. Origen, an early church father (died 232 CE) wrote:

"We are forthwith to reject as spurious the copies in use in our Churches, and enjoin the brotherhood to put away the sacred books current among them, and to coax the Jews, and persuade them to give us copies which shall be untampered with, and free from forgery.".[18]

So, your contention that the pre-christian Septuagint validates your view is flawed. There are no pre-christian septuagints, only manuscripts from the Christian era. The Jews stopped using the LXX because it did not agree with the Hebrew texts. So either the Christian era versions were changed or the "original" pre-christian documents were flawed and not discovered as such by the Rabbi's until the 1st or 2nd century CE. So, since only existing manuscripts are of Christian origin, my claim stands.