I have a Lenovo Chromebook Duet 2 and I haven't regretted it at all. Graphical Emacs is important for me as I want to view my notes on it and I cant do that well with the terminal version. So that removed any Android/Apple tablet. Unfortunate as it may be, I don't think there is any mature, budget Linux tablet and Chromebooks, which support Linux out of the box are the closest to that.
It's lightweight, with a 10 inch screen and I can comfortably use Emacs with the keyboard it comes with. You could go even smaller screen, but imo, after one point it stops being comfortable. So this is a very fine solution for me
Not sure about Nov specifically, but this is a thing with a lot of packages due to keybindings. Evil-collection bundles fixes for a lot of these packages and some even have separate solutions. Worst case is you have to rebind some keys manually, but nov is fairly well known so someone will have done it already