Keyboard for Pocket CHIP

Back in 2016, there were, in my opinion, a wonderful and even unique device called Pocket CHIP on sale. I am the happy owner of this artifact.

The device is very interesting, but there are a number of disadvantages, one of which is a simple keyboard on a printed circuit board. I used someone else's project for 3D printing (https://www.thingiverse.com/thing:3083842) and this is what I got.