The DIY version of this is a bunch of USB hubs combined with a set of these readers https://www.kingston.com/en/memory-card-readers/mobilelite-plus-microsd-read

The DIY version of this is a bunch of USB hubs combined with a set of these readers https://www.kingston.com/en/memory-card-readers/mobilelite-plus-microsd-reader https://www.kingston.com/en/memory-card-readers/mobilelite-p... And writing the cards can be done with Balena Etcher https://www.balena.io/etcher/ https://www.balena.io/etcher/ Works well enough and much cheaper than the Pro version. Using it regularly to provision Raspverry Pi-s.