The I Am Legend star pulled out of negotiations in April (10) after months of discussions with Crowe, and the filmmaker was forced to start his search for a leading man all over again.
Crash actor Howard has now put himself forward to take on the project - but admits he's hesitant about taking on such an iconic role.
He tells Deadline.com, "Nothing's been signed on paper yet. Everybody who loves music will hate me if I get this one wrong."
Crowe has been trying to get the project off the ground for four years.