Thank you for providing the Hebrew Idiom citations.
I will now review these three citations:
This phrase occurs 74 times in the King James Version of the Christian Bible:
Genesis 38:20
Genesis 49:24
Exodus 4:13
Exodus 16:3
Exodus 35:29
Exodus 38:21
Leviticus 8:36
Leviticus 10:11
Leviticus 16:21
Leviticus 26:46
Numbers 4:37
Numbers 4:45
Numbers 4:49
Numbers 9:23
Numbers 10:13
Numbers 15:23
Numbers 16:40
Numbers 27:23
Numbers 36:13
Joshua 14:2
Joshua 20:2
Joshua 20:9
Joshua 21:2
Joshua 21:8
Joshua 22:9
Judges 3:4
1 Samuel 11:7
1 Samuel 18:25
1 Samuel 27:1
2 Samuel 3:18
2 Samuel 10:2
2 Samuel 11:14
2 Samuel 12:25
2 Samuel 21:22
1 Kings 2:25
1 Kings 8:53
1 Kings 8:56
1 Kings 14:18
1 Kings 16:7
2 Kings 14:25
2 Kings 14:27
1 Chronicles 6:15
1 Chronicles 20:8
1 Chronicles 29:5
1 Chronicles 29:8
2 Chronicles 8:18
2 Chronicles 10:15
2 Chronicles 12:7
2 Chronicles 23:18
2 Chronicles 24:11
2 Chronicles 26:11
2 Chronicles 33:8
2 Chronicles 35:6
Ezra 1:8
Ezra 8:33
Nehemiah 9:14
Job 27:11
Psalm 77:20
Proverbs 26:6
Isaiah 51:18
Jeremiah 19:7
Jeremiah 27:3
Jeremiah 29:3
Jeremiah 38:23
Ezekiel 25:14
Ezekiel 28:10
Ezekiel 30:10
Ezekiel 30:12
Acts 5:12
Acts 7:35
Acts 11:30
Acts 19:11
Acts 22:11
Colossians 4:18
This phrase occurs 26 times in the King James Version of the Christian Bible:
Genesis 23:3
Genesis 43:34
Genesis 47:10
Exodus 4:3
Exodus 13:22
Exodus 14:19
Exodus 23:28
Exodus 23:29
Exodus 23:30
Leviticus 9:24
Leviticus 10:4
Numbers 17:9
Numbers 20:9
Numbers 32:21
Numbers 33:8
Numbers 33:52
Numbers 33:55
Deuteronomy 2:12
Deuteronomy 2:22
Deuteronomy 4:38
Deuteronomy 6:19
Deuteronomy 9:4
Deuteronomy 9:5
Deuteronomy 11:23
Deuteronomy 12:29
This phrase occurs 4 times in the King James Version of the Christian Bible:
2 Chronicles 35:22
2 Chronicles 36:12
Jeremiah 36:4
Jeremiah 36:32
Summary:
None of the cited idioms are unique to the Book of Mormon and incapable of being copied from the King James Version of the Bible - in fact, it is more likely that they were copied from the King James Version of the Bible as the idioms are very like near copies of sections in the King James in some cases.
For example: Nephi 13:24
"And the angel of the Lord said unto me: Thou hast beheld that the book proceeded forth from the mouth of a Jew; and when it proceeded forth from the mouth of a Jew ..."
Jeremiah 36:4 KJV
"Then Jeremiah called Baruch the son of Neriah: and Baruch wrote from the mouth of Jeremiah all the words of the Lord, which he had spoken unto him, upon a roll of a book."
If that is not close enough, there are more exact copies of the phrases such as 1 Nephi 4:28 and Joshua 10:11 as found in the KJV.
Here, you have:
1 Nephi 4:28
"And it came to pass that when Laman saw me he was exceedingly frightened, and also Lemuel and Sam. And they fled from before my presence; for they supposed it was Laban, and that he had slain me and had sought to take away their lives also."
Joshua 10:11 KJV
"And it came to pass, as they fled from before Israel, and were in the going down to Bethhoron, that the Lord cast down great stones from heaven upon them unto Azekah, and they died: they were more which died with hailstones than they whom the children of Israel slew with the sword."
Now, for comparison; let us take a look at how the actual literal translation of Joshua in the Hebrew is rendered when not translated into King James English.
וַיְהִי בְּנֻסָם מִפְּנֵי יִשְׂרָאֵל, הֵם בְּמוֹרַד בֵּית-חוֹרֹן וַיהוָה הִשְׁלִיךְ עֲלֵיהֶם אֲבָנִים גְּדֹלוֹת מִן-הַשָּׁמַיִם עַד-עֲזֵקָה--וַיָּמֻתוּ: רַבִּים, אֲשֶׁר-מֵתוּ בְּאַבְנֵי הַבָּרָד, מֵאֲשֶׁר הָרְגוּ בְּנֵי יִשְׂרָאֵל, בֶּחָרֶב.
Reversing the order into English alignment from left to right instead of right to left (as the above is presented) the exactly "literal" phrases are:
and·he-is-becoming in·to-flee-of·them from·faces-of Israel they in·descent-of Beth-Horon and·Yahweh he-flung on·them stones great-ones from the·heavens as-far-as Azekah and·they-are-dying many-ones who they-died in·stones-of the·hail from·whom they-killed sons-of Israel in·the·sword.
So the "literal" ("Literal translations of Hebrew idioms...") Hebrew Idioms are not translated at all.
The "literal" would be "in to flee of them from the face of"; at the very least, it would be something along the lines of "they fled from my face" or "they fled from the face of myself" - at the very least.
The King James has "from before" because it is an English translation OF the Septuagint, and Latin Vulgate as they desired.
For example, if you flip to the Setuagint section of Joshua, you won't find "from before".
ἐν τῷ δὲ φεύγειν αὐτοὺς ἀπὸ προσώπου τῶν υἱῶν Ισραηλ
Which is using προσώπου, as the Hebrew does. This means "face".
There is no, "from before" in either the Hebrew or Septuagint; that is not the literal Hebrew idiom.
The Hebrew idiom is to refer to the face as that which another leaves, for it is with the face that witness is held, and it is the face in which one can judge.
To remove one's self from the face of another is to hide in shame.
Simplifying the phrase to "from before" does not accurately convey the Hebrew cultural connotation of the idiom.
This is a unique flaw in the rendering of the King James Bible and does not appear in prior Masoretic or Septuagint copies of the Hebrew Bible where employing the same Hebrew idiom.