Question about Logitech MX Mechanical Mini

Does anyone know whether the keycaps can be ordered individually or as a set? My son pulled off a key and the (very thin-walled!) plug-in base broke. I was able to glue it but have no idea how long it will last... Alternatively: Which other keycap sets available here would theoretically fit? Apart from the space bar, which is not standard, it should be possible to use other caps.