For clarity, we are discussing related questions.
1) Does every TR variant we accept require extant Greek manuscript evidence?
(else an egregious violation of preservation)
2) Is all preservation in Greek? I
And is this mirrored by all autographs being in Greek?
3) Can there be multi-language authorship of the scriptures?
Just looking at your position on (3), please note William Whitaker.
A Disputation on Holy Scripture: Against the Papists, Especially Bellarmine and Stapleton (1588, 1849 edition)
William Whitaker (1548-1595)
https://books.google.com/books?id=WK7yPBiP1GcC&pg=PA125
... he (Jerome) says that the Epistle to the Hebrews was written in Hebrew ... the Greek edition both of the Gospel according to Matthew and of the Epistle to the Hebrews is authentic. For the Hebrew originals (if any such there were) are now nowhere extant, and the Greek was published in the life-time of the apostles, received in the church, and approved by the apostles themselves.
Do you find Whitaker's position acceptable?
Or do you reject it due to egregious violation?
Thanks!
Steven