microSD breakout board can be used for sniffing commands sent from SD host or emulating SD card.

For out of EU shipping, please order from my worldwide distributor:

https://www.elecrow.com/microsd-breakout-board.html

It has pads for connecting 1.27mm pitch ribbon cable and holes for 2.54mm pin header.

Can be used for reading eMMC modules inside of devices (see https://blog.danman.eu/about-adding-a-static-route-to-my-docsis-modem/).

Can be cut with standard scissors to use only one half (male or female).