Yes, there are adaptors, but it won't fit with the same loopback HDMI board that's included with the screen. It'll need a wire, which effectively doubles the space it'll take up on a desk.

If there are any other high-res small (<= 4") screens, please let me know - the highest DPI that I know is an iPhone 4S 960x640 3.5" screen with a Creotech adaptor.

also, 15W is max power I suppose, how low can it go if you configure and use it for small tasks

from their benchmarks: https://www.raspberrypi.org/magpi/wp-content/uploads/2019/06...

I wouldn't be surprised if downclocking it would reduce the consumption even further. Also this was with a screen+kb/m attached so that's extra.