I will go out on a limb and say that's not going to be an Apple product, period. It doesn't fit anywhere in the value envelope.
The relevant questions here are: will the person using this machine also conceivably be wearing a pair of $549 AirPod Max? Or a $399 base Apple Watch? Does that person expect to pay more or less for their largest-screen computing device than their headphones?
Framing that way points toward a $350 price point being a laptop for young children (younger than Apple Watch age, so lower elementary). That's a whole different software experience beyond just the hardware.
The relevant questions here are: will the person using this machine also conceivably be wearing a pair of $549 AirPod Max? Or a $399 base Apple Watch? Does that person expect to pay more or less for their largest-screen computing device than their headphones?
Framing that way points toward a $350 price point being a laptop for young children (younger than Apple Watch age, so lower elementary). That's a whole different software experience beyond just the hardware.