“Those who relied on the daily sacrifice instead of invoking 1 John 1:9 (confessing directly to God) were in effect crucifying the Lord all over again...”
There is no hint in the letter that he is discussing people currently offering blood sacrifices while calling themselves Christians. He points out the superiority of Christ to Old Testament law, but ANYONE trusting in animal sacrifice INSTEAD of Christ would have been condemned outright and vehemently.
“It was written to Jews who had converted to Christianity and were under intense pressure to go back under the Law.”
If they went back under the Law after having converted, then they would be doing what you say is impossible. They would have been converts who then rejected Jesus Christ, and your argument is that NO CHRISTIAN CAN EVER DO SO.
Hence the name of the letter Hebrews?
Hebrews 3
9 Where your fathers tried Me by testing Me, And saw My works for forty years.
10 “Therefore I was angry with this generation, And said, ‘They always go astray in their heart, And they did not know My ways’;
11 As I swore in My wrath, ‘They shall not enter My rest.’”
There were no Gentiles among whom he was speaking to.
All through Hebrews the topics are of the LAW, yearly sacrifices, daily sacrifices and Moses. Of which no Gentile would understand any of it.