Thanks everyone for the educational responses! My daughter and I are now happily playing in one of her bedrock worlds on LAN using the steam deck. Steam deck setup for the bedrock launcher was a bit tricky but now it runs awesomely, in game mode, and even has the exact same controller setup. If anyone is curious about how to set this up I’d be glad to help, I had lots of tricky missteps on the way, but I got there.