What I like about the picture is that the user could've plugged in their smartphone on that monitor and then have a decent screen. Now, one may argue I type blind. Then, why does the screen have to be on? Smartphone screen size is meant to be used from hands, not such a distance. Ie. I don't think this setup is ergonomic (eyes, RSI).

Nokia also had a foldable keyboard. Which I've used with Nokia N810 and Nokia E71 (good to compare with their native keyboards with device in hand). I think I brought mine to the bin because the comfort was terrible. The lack of travel and latency, for example (I believe this is better nowadays.) A 60% keyboard can be pretty small, too. With USB2BT+ you can turn any USB device into Bluetooth. Works OK with powerbank (you can DIY that with 18650 batteries).

I wouldn't use a high-end smartphone in China though. I'd bring a burner, and consider any hardware I brought with me compromised.

So perhaps that isn't the place to do digital notes, and just write analog in the most fucked up handwriting you got. If they OCR it, let them have some fun with their models. Of course, that may also mean you cannot apply OCR on ypur notes. But the latest Mistral OCR I tried was very good. As a European, -unfortunately- I'd apply the same rule to USA nowadays though.