You are contradicting 25 centuries of Jewish thought on the issue of the lost tribes. The Jews have claimed throughout the centuries that they only represent two tribes. Christians claim that the Jews represent all 12 tribes. Jews on the other hand have never claimed this.
It’s not me contradicting Jewish thought, but the Bible.
2 Chronicles 11:16-17 says the faithful from every tribe followed the Levites from the Northern Kingdom to the South after the death of Solomon.
Rev. 7:1-8 says there will be Jews from all 12 tribes in Israel before the Great Tribulation begins.
And Ezekiel 48 shows new land grants to all the 12 tribes at the beginning of the Kingdom Age.