Interpol are famously slow at accommodating americans. And they likely won't hand over people they're looking to go after for the same shit. Why give the SEC the credit when you can have it right?
If Perring is in the UK, then he's done for fairly quickly, even on our way out of the EU we're still interesting in remaining a part of Interpol and sharing information.
As per Bernarde and Lau in Australia, then god only knows. They likely won't go to trouble of inditing them and dragging them off of a prison colony just to dump them in prison. Whether Australian authorities will have any interest in probing their ass's is a different question, but being in that all of this is their failed attempt at stock manipulation, preceded by 3 other failed attempts, then they're nothing worth worrying about. A different matter if that South African bank did fail though.