Hi Cold Steel,
"Nephi and other prophets in the Western Hemisphere had the book of Isaiah and likened portions of it to themselves; however, these passages were very intelligently used and applied. They just weren’t data dumps. And if you compare the texts, they also weren’t word-for-word transliterations."
What the Book of Mormon contains in these sections is not an original translation from Hebrew to reformed Egyptian to English. The language "reformed Egyptian" is mentioned in the Book of Mormon (Mormon 9:32), but otherwise there is no evidence such a language ever existed. What the Book of Mormon contains in these sections is word-for-word KJV text of 1611. Obviously, the story of the Book of Mormon does not allow for KJV text of 1611 to be a source. What you say, though is key, lets compare the text, this is easy and beyond any further arguing. It is either word-for-word KJV or it is not. I've suggested 2 Nephi 22 vs KJV Isaiah 12.
http://www.lds.org/scriptures/bofm/2-ne/22?lang=eng
vs
http://www.biblegateway.com/passage/?search=Isaiah%2012&version=KJV
Here is the text...
2 Nephi 22:1 And in that day thou shalt say: O Lord, I will praise thee;
though thou wast angry with me thine anger is turned away, and
thou comfortedst me.
Isaiah 12:1 And in that day thou shalt say, O LORD, I will praise thee:
though thou wast angry with me, thine anger is turned away, and
thou comfortedst me.
2 Nephi 22:2 Behold, God is my salvation; I will trust, and not be afraid;
for the Lord JEHOVAH is my strength and my song; he also has
become my salvation.
Isaiah 12:2 Behold, God is my salvation; I will trust, and not be afraid:
for the LORD JEHOVAH is my strength and my song; he also is
become my salvation.
2 Nephi 22:3 Therefore, with joy shall ye draw water out of the wells of
salvation.
Isaiah 12:3 Therefore with joy shall ye draw water out of the wells of
salvation.
2 Nephi 22:4 And in that day shall ye say: Praise the Lord, call upon his
name, declare his doings among the people, make mention that his
name is exalted.
Isaiah 12:4 And in that day shall ye say, Praise the LORD, call upon his
name, declare his doings among the people, make mention that his
name is exalted.
2 Nephi 22:5 Sing unto the Lord; for he hath done excellent things; this is
known in all the earth.
Isaiah 12:5 Sing unto the LORD; for he hath done excellent things: this is
known in all the earth.
2 Nephi 22: Cry out and shout, thou inhabitant of Zion; for great is the
Holy One of Israel in the midst of thee.
Isaiah 12:6 Cry out and shout, thou inhabitant of Zion: for great is the
Holy One of Israel in the midst of thee.
The reason why I've been pointing to 2 Nephi 22, is it shows a translation style of the KJV translators. Where the divine name YHWH appears in Hebrew, they typically did not translate it, but instead substituted the word LORD. There are a few exceptions to this general rule and this is one, where LORD JEHOVAH is the translation of the Hebrew phrase Jah-Jehovah. Nonetheless as you can see it is word-for-word and this goes on for several chapters in this section.
Cheers,
-Randy