Hello, as the other person said in his comment, just type 915 tkl key caps on Google and sites of Chinese origin offer all sorts of keys adapted to this keyboard at OK prices, for my part I found replacements for less than 10.-.
This product is equipped with GL touch switches. We do not sell it with other types of switches. This is a CH keyboard (qwertz, with accents: é, à and è).
The keyboard has a Swiss ISO layout, i.e. the arrow keys next to the shift key are present. The second picture shows a US layout. However, pictures are not binding on Digitec, what counts are the specifications.
Unfortunately, we do not have any information on this yet. As soon as the product becomes available for us through our suppliers, we can check a possible inclusion.