Made sure the stock firmware printed the example gcode that came on the SD card and then immediately embarked on my journey to get klipper running on this guy.
I didn’t finish until the wee hours this morning so I’ve yet to really give it a go but all the essentials are operational.
Here’s the GitHub link to the config I created: https://github.com/0xD34D/ender3-v3-se-klipper-config
Yeah, get mainsailOS with klipper
Octoprint has tons of great plugins and features that mainsail/fluidd have no equivalent for, and can be used to control klipper printers too.