The "Book386" (a Hand386 in the Book8088 case) that I've long wanted was just released (called the Pocket 386)! https://www.aliexpress.us/item/3256805356267711.html
@polpo I would strongly suggest watching the video on that page and paying attention to the 4:3 resolution being stretched on the widescreen panel though, and the "mouse" appears to be by mode-toggling the cursor keys.
@LionsPhil unlike their previous devices which always stretch to widescreen, you can actually get into the display's OSD and set the ratio to 4:3 (and adjust color balance, which can get out of whack on the Hand386... I went down a huge rabbit hole with mine). The mouse seems fine for quick testing which is perfect for my use case (developing PicoGUS on the road).