My question is as follows: Can we know what the accepted interpretations were pre Jesus? Or is all of the commentary post-Jesus?
Note, that there are 27 books in the Greek Testament, and NONE of them quote Daniel 9!
Not any of the authors of Matthew, Mark, Luke, or John.
Not in the letters of Paul. Not in the letters of Peter.
Apparently, no one in first century Christianity thought that it was important enough to mention an alleged prophecy about the exact year their Messiah was going to get killed. This implies, that even in the early years of POST Jesus, Daniel 9 was still not interpreted as being about Jesus.
For clarification: the anointed one in Daniel 9:25 and the other one in 9:26 are different. You seems to say that the Jewish perspective (on the entire chapter?) refers to Cyrus, but this is true only to 9:25. The one that is cutted off (in v. 26) is identified as being Agrippa per Malbim, Metzudot David and Rashi.
Given that oto haish was born in 4 BCE, the only reference made to the "seventy weeks" and the "anointed one" of Daniel 9:26 prior to that would be the essenes. A few references are found in their sources and according to the Testament of Levi and Pseudo-Ezekiel Document (4 Q 384-390) their eschatological figure would appear between 3 BCE and 2 CE, later than Jesus' birth.
The following is a summary of interpretations of the "seventy weeks" and the "anointed one" of Daniel 9:26 in other pre-Common Era sources. Both are non-messianic:
Pseudo-Demetrius (2nd century BCE or later) = the anointed one who is cutted off in v. 26 refers to Onias III.
Septuagint (200 BCE to 50 CE) = the anointed one who is cut off in v. 26 refers to Onias III.