Pleased to discover there are ready to use, non-emulation SD card mux devices available!

These are great for 99% of the use cases folks message me about.

https://wiki.tizen.org/SDWire

SD Wire

https://www.tindie.com/products/badgerdnl/sdwire-usb-c-sd-card-reader-sd-mux/ ~ $95

https://3mdeb.com/shop/open-source-hardware/sdwire/ ~ 89 €

USB-SD-Mux from Linux Automation GmbH ~ 100 €

https://shop.linux-automation.com/usb_sd_mux-D02-R01-V02-C00-en


Although utilizing SD emulation as this project does, provides benefits such as speed and durability, the related costs and complexity outweigh these advantages. It only makes sense to use SD emulation if the cost of not having these features is higher.