The Remarkable 2 runs Android and has a USB-C port so it might support a wired keyboard.
Although I’m not sure if the screen refresh and cpu are fast enough for comfortable typing. I already get frustrated using the onscreen keyboard for typing a 10 character notebook name.
You can SSH into it in order to add software to enable an external keyboard. But that's not the point of the device, which is that it's a digital pad of paper, and all the freedom from trying to draw perfect drawings in Powerpoint/Visio/Whimsical.com using a mouse.
The problem with the device is that, entirely unsuprisingly, it turns out I can type way faster than I can write with a stylus after years of typing. But I really like my Remarkable2, I just haven't figured out how to fit it into my life - I've spent so long wanting a device like that, that I've got all these other things in place that I don't seem to need it. I journal using google docs, and the Remarkable2 doesn't have any integration there. I use it for quick notes, drawing diagrams and also learning to draw still life.
I'm very happy with my purchase, but it is very much a niche product. I didn't buy one to get an eink terminal, so I haven't tried it out as such, and can't report on how well it does as one, but I don't think it would do well at scrolling pages like you would a terminal. (But I'm a fan of Alacritty on OS X, so my demands on a terminal are also niche.)
It doesn't run Android. It runs Linux. There is already similar devices with front lit eInk screens and support keyboards out of the box too with Bluetooth or USB C. The Boox Note Air is an example. It's considerably more powerful than the Remarkable 2 and in the A2 refresh mode typing with a keyboard is not too bad.
Although I’m not sure if the screen refresh and cpu are fast enough for comfortable typing. I already get frustrated using the onscreen keyboard for typing a 10 character notebook name.