I made this little SD card guide for easier no-look card insertion, since the SD reader is on the back of my 2017 iMac Pro monitor... I guess it's a niche product, but if there is interest for other models (specifically with a flat surface rather than this slightly curved one) let me know in the comments and I might make another version.

This piece is simply glued into place using a tiny dab of E6000 (while an SD card is inserted, to prevent getting glue in the slot and for perfect alignment)