@sun Lilygo T-decks require little assembly (no soldering), but needs a 3d printed case. They're nice because they don't require a bluetooth device to send messages, as it has a built-in keyboard.
If you want a zero-assembly ready-to-go device that pairs with and uses a phone for comms (which is what all but the T-Deck are), then I suggest the T-echo. Comes in a case, small form factor, e-paper screen. No assembly or soldering required. Has the SX chip, which you want.https://www.lilygo.cc/products/t-echo