I sold my PSP years ago and now have a modchipped switch. With the release of android for it, I can play most PSP games on the PPSSPP emulator. Some games have issues, but even the God of War games run at full speed. It’s definitely not as small as the PSP or Vita. I’d recommend getting the OLED model and using a mod chip, as that’s probably the only way to hack it. Nintendo really locked down the later versions
There is an Infinity Blade discord that has all the different steps and requirements to install and launch the games. Also they have troubleshooting and support channels. I don’t know what the linking rules are for it, so I’m not going to link it.