I hacked my PSP and works really well (plus, the process is idiot proof).
The battery life is awful though, regardless of whether you play ISO-based PSP games or old school games. Plus, in the UK anyway, they're still not that cheap second hand though.
I'd love to see some recommendations on this, too!
A couple resposes from the Discord chat:
scribe99: I’m considering getting one of these. If you buy the 16gb +64 gb version it supposedly comes with the games preloaded. Or you can load them yourself. https://www.anbernic.com/phone/eac_phone_sel_one?eng_ApplianceVo.eac_id=70
chaos: I'd just get a used PSP and hack it