I am working on the same kind of thing. For me the ideal keybaord/screen combination was the Keyboard Featherwing from Adafruit https://www.adafruit.com/produc

I am working on the same kind of thing. For me the ideal keybaord/screen combination was the Keyboard Featherwing from Adafruit https://www.adafruit.com/product/4818 https://www.adafruit.com/product/4818 . Unfortunately, it is a discontinued product. I managed to snag one of the last ones, but I am reluctant to use something that I cannot get any more of.