You can do it no bother at all mate.
I've got PES17 on the PS3. Got the option file off one of the forums and stuck it on easy as you like. The guy that made the file is Mexican I believe so it meant I could transfer Pena and Herrera into my side as he had put in the full Mexican League.
I imagine the same will be available pretty quick for PES18 when it comes out.
Aye, I'm still dreadful at tactical defending.