There are a number of other eink tablets on the market, most of which run Android and are therefore a good amount more customizable. For example, I'm using a Boox Note Air (https://shop.boox.com/collections/all/products/boox-note-air3), which has a similar screen and runs Android. It also comes with a split screen functionality, so you could connect a bluetooth keyboard, have the book open on one side and a vim emulator on the other. That's pretty close to my workflow for reading books/papers.
There are a number of other eink tablets on the market, most of which run Android and are therefore a good amount more customizable. For example, I'm using a Boox Note Air (https://shop.boox.com/collections/all/products/boox-note-air3), which has a similar screen and runs Android. It also comes with a split screen functionality, so you could connect a bluetooth keyboard, have the book open on one side and a vim emulator on the other. That's pretty close to my workflow for reading books/papers.