In The Sarah Connor Chronicles, one Terminator accidentally time traveled decades too far into the past, its arrival tweaking the timeline such that the person it was supposed to assassinate wouldn't be at the venue he was supposed to be. The terminator became a businessman and built a construction company, just to build the building where the assassination was to take place. According to records found, it was loved by its workers, since it cared more about getting the job done than about profits, and would regularly work alongside them.

So yeah, the idea doesn't need a lot of tweaking for a lawyer terminator to exist. They already do whatever they need to for their goal, they aren't just killing machines.