I think that if you go the C++ route, you can publish to . PS4, PSVIta and the XBoxes, you can’t go the PSM route cause that is all C#, that’s why unity can do that.
But as Maximusdb3 said, you need to talk to Epic but even before that you have to be a Sony Registered developer, which is getting easier and easier everyday, Sony is making it painless for indies, I’m not sure if sony charges you to register but you can register here: PlayStation® Official Site: Consoles, Games, Accessories & More
plus they loan DevKits which before you had to buy for $2K or more 