Undeclared into Impacted Major at UCSD?

So after much advocating on my part, I’ve finally been accepted as a transfer to UCSD, however it was not as electrical and computer engineering. I was accepted as undeclared. How difficult will it be to change my major from undeclared to an impacted major? Has anyone had any experiences with this who is attending UCSD? I’m not sure I want to attend UCSD simply because of this, however, I haven’t been accepted anywhere else. I’m currently appealing my applications to other UCs too because I’m a vet stationed OOS and I’m confident mistake were made on my applications.

https://www.ece.ucsd.edu/impacted

Completed all of the electrical engineering requirements with the exception of ECE 35, 45, and 65. How difficult would it be to get enrolled in those courses as an undeclared major? Wouldn’t they give preference to those who are declared EEs?