I was able to do this to my VW by using a OBD2 dongle to set the auto-start-stop battery voltage threshold higher so that it always thinks the battery is low and the engine needs to keep running.
I found the comment section of this video incredibly sus. Everyone speaks perfect english and has only the highest of praises. Quite a few were even “in tears” while watching the video.
It’s an OBDEleven. It only works for VW, Audi group cars though.