Gaffe

Glad to hear you're on the mend. RIP the bike

Anbernic RG353VS - I'm using a third party OS and it's my go-to handheld when the steam deck is inappropriate. Fits my hands and plays my favorite games. I love it for GBA and SNES.

PowKiddy RGB30 - second choice. I like the bigger screen and it's a 720x720 screen that works great with game boy. I use a third party OS and play a lot of Pico -8 stuff on it too.

PowKiddy RK2023 - Adequate, not Great. Boots slow. Doesn't feel good in the hands.

PowKiddy v90 - practically e-waste. Processor too anemic to run SNES. GBA emu was fine. Plastic so cheap I fear the stupid thing would shatter with a short drop.

Folks like me that were and remain unhappy with OW2 don't miss 2016 OW1, we miss 2022 OW1.

FTL

My understanding is that most cheats for retro consoles are a memory location plus a value to write in that location.

I believe that's how the "game genie" worked on nes, snes, and OG game boy. Have you tried entering some game genie/game shark codes in the RA cheats for your core?

It's been a while since I used cheats on RA other than save states and rewind but I know I've gotten them working before (years ago) on snes

Fake-08 development trails PICO-8 so it's possible your Fake-08 version is out of date, the cart is made with a newer PICO-8 version, or the cart is just plain incompatible with Fake-08 (many carts do not work with Fake-08).

I have a couple handhelds like yours and the official raspberry pi PICO-8 build works great on them - I suggest you get a PICO-8 license and check your distribution's documentation to learn where to place the raspberry pi PICO-8 binary in the filesystem.