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That would mean hacking your PS4.
I think you'd better ask on some PS4 hacking site to get an answer.
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You also have to keep in mind that Sony emus are design to work only with "classics" games which mean, bad compatibility. I tested a few games on the integrated emu and the results are not good. Every Ratchet games crash when loading a game level (even the demos), same for Jak2 (yeah it wont work with a custom iso, Sony probably patch it to make it work) and many, many others. So even if PCSX2 is slow on the PS4, it's the only way for a large number of games.