it's an interesting idea for sure but there's always been a plethora of homebrew emulators for the PSP. do they not work well anymore? Or does the Pi just have more modern emulator options?
In that case, the Pi Zero 2 W ought to be enough, as its Cortex processor is leaps and bounds better, with a quad-core vs the Pi Zero's single-core, low IPC ARM CPU.
Crazy times we live in :)