Here in Victoria mine was probably two years from import to rego while rebuilding, and when inspected, I don't think they even looked at the date on the import licence, nor opened the expensive engineering report.
It was imported by Russell at Just Mustangs and registered by me personally, so no issue with the change of details here.
But absolutely check with your WA rego authority, as they are the bee's knees when you front up on the big day.