Ordered a Raspberry Pi 4 along with a portable game hat kit to make it a handheld emulation device. It’s the cheapest solution to portable gaming for the Pi that I could find.
A couple of advantages the Pi 4 will provide over the OGA is double the RAM, a faster clock speed, etc, meaning N64 games should be able to be emulated. The Pi is also capable of streaming Steam games from another computer on the same network.
Only hard part now is waiting. I may very well post a review on it.