What is the most reliable design of a backlit button with an easily replaceable pusher (cap)?

Question

Electronics

This type of button will be used in a children's toy in which the child can change the patterns for the buttons.
Example:
M101
The buttons themselves are supposed to be made square, at least round. In size - approximately 20x20mm Button
caps should be easy to remove, but at the same time sit on the button securely and not fall off.
From what I found:
TP615L
Maybe there are some terms that are easier to search on the Internet?
Or maybe there are other types of designs - the main thing is that you can easily and easily change the pattern on the buttons.