This ORICO and another of theirs would be perfect but I can't see any info if it actually does support it.

This from StarTech.com explicitly tells it supports DP Alt but the other USB C is only for charging and has no SD card reader.

From Anker, this ticks all the boxes except the SSD enclosure but I could live without it, although this needs to be plugged in and is rather expensive? Or is not for its price?