From what I’ve seen replacing the SSD really ain’t that hard. But the SD card speeds are not that bad for many lighter games.

was gonna recommend considering piracy, but since its against the rules I will respect that and recommend some of my favorite games i play on the SD and my PC instead:

• very chill relaxing game: https://store.steampowered.com/app/1455840/Dorfromantik/
• one of my favorite games of all time: https://store.steampowered.com/app/548430/Deep_Rock_Galactic/ (ROCK AND STONE!)
• really good online FPS (i dont actually play this one the sd as i dont like playing it with a controller but ive met people on there that do): https://store.steampowered.com/app/2073850/THE_FINALS/
• and for lasts a non steam game: Minecraft, no not bedrock edition (i dont think that even runs on linux well) java. install the prism launcher and then with that use a modpack with the controlify mod, it has built in steamdeck support. Such a cozy experience playing MC on the Steamdeck, especially with a friend that you’re next to irl.