I am challenging the medieval KJV version to be perfect.
1. "Medieval" was from the 5th to the 15th century. Since the KJV is from the 17th century, your allegation is false.
2. Also if you wish to have an updated KJV, all you have to do is look. The King James 2000 Bible should be quite adequate.
3. As to "perfect" the Authorized Version was meant to be
the best of the English translations in use at that time, and after its publication it became the Authorized Version, and also practically the sole Bible of English-speakers and English-readers for over 300 years. Every major Bible study tool, every major Bible commentary, every major systematic theology used the KJB as the Word of God.
4. Could there be further improvements to this venerable and venerated Bible? Absolutely.
But only if the textual critics totally abandon their nonsensical view of the "oldest manuscripts", and make the effort to collate ALL existing manuscripts to determine the Majority Text. That has not been done, and will NEVER be done as long as textual scholars idolize Codex
Vaticanus (Codex B) and Codex
Sinaiticus (Codex Aleph). Since these two are among THE WORST manuscripts in existence, they would have to be set aside completely.