I still don't like group buys so this post is not about HungHingDaiLo's GMK Zìmō set (inspired by Mahjong tiles) but the interesting keycap/artisan concept shown in the picture above.
The Monokei Collab Metal Artisan features interchangeable white tops – 白板 (White Dragon), 紅中 (Red Dragon) and 發財 (Green Dragon) in this case.
Apparently with a magnet in the middle of the keycap base, this is something I've never seen before.
There were the Filco Majestouch "patch keycaps" sporting a similar "convertible" top, announced in early 2021, but they use a different mechanism.
Let's see how these magnetic ones turn out! Until then, use this concept as a source of inspiration.
This render of a split keyboard half by Wizarddata inspired Valarauka_ to come up with the idea of a fractal keyboard. Put on my list right after the book keyboard.