It is simply begging the question and arbitrary contrary to evidence to say the KJV is the final authority. This was not God's intent nor the KJV translator's intent. They were in the position to know and would resist KJVO controversy stronger than I am.
The Greek manuscript evidence is over 99% accurate with no significant issue. Any major evangelical translation will lead to the same doctrine and practice. Just using KJV will still lead to countless interpretations as evidenced by Mormons, JWs, Westboro Baptists, etc. who use KJV.
KJVO (Riplinger, Ruckman, etc.) conspiracies about moderns removing grace, Deity of Christ, etc. can be shown to be nonsensical. The same arguments can also be used to show that KJV is weaker at times in some verses. To be consistent, you should say KJV is trying to hide truth.
We are all in the same boat. You have a simplistic error: KJV alone=Word of God alone. Proponents even say that if the underlying Greek disagrees with KJV, then the Greek must be wrong (that the KJV is based on)?! When the wealth of MSS evidence disagrees with KJV, there is no logical, biblical reason to favour KJV over the evidence.
This leaves us with the necessity of textual criticism, hermeneutics, translation theory that honors God and His Word. KJVO undermines the credibility of men of God and the Word itself. Turning it into a sect is even more odious.