The Trimui / Powkiddy A66, what the Super Impulse Micro Arcades should have developed into, sort of.
Sort of because of course they wouldn't release something where you could load any ROM onto but what they should have made was something with a proper speaker and that could play the actual arcade ROMs instead of their flawed ports. This is barely bigger and can do that so just replace the micro-SD slot with some soldered memory and instead of being too greedy/incompetent put more than one licensed game on them but oh well.
Anyway I put a 64GB card in this and use the Minui loader for classic consoles and GMenuNX for arcade games. FBA is the most miss to hit with compatibility but I'm not sure which set it uses. Also some of the emulators need the ROMs extracted it seems while some are fine in zip files. CD games can be loaded more directly in the UI if only I wasn't so lazy about renaming some of the folders. PS1 games triggers (L2 & R2) can be "pressed" by holding down menu and pressing L or R. Binaural ("stereo") audio can be achieved with a USB C to 3.5 (with built in DAC chip of course) cable.
I tried some experiments with the recording set up that really didn't work well and even worse messed up the audio. I'm too apathetic right now to rerecord this content though.