No, he has not. And I'm a little sad that you fell for Schumer's line on this.
Trump has been firm on this and, because Lindsey Graham chose to scapegoat Miller does not mean that Miller was wrong.
You're right. In this case Trump has been consistent - he's open to DACA protections in exchange for other border security and immigration policy reforms.
The democrats (and the Lindsey Graham GOP wing) WILL NOT compromise on actual immigration reform, illegal and otherwise. They never have, they never will.