USB "insertion" for permanently-connected devices

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In other threads I've mentioned I have a USB-powered external SATA
dock, which I'm using mainly as a backup device. Currently, I have a
script to power it down by doing this sort of thing:

   echo 1 > /sys/block/sdd/device/delete

I can then turn it on again using:

   echo "- - -" > /sys/class/scsi_host/host6/scan

This works, but is a kludge. A cleaner way would be to use:

udisksctl power-off -b /dev/sdd

This works too, but unfortunately also removes the /sys/block/sdd
files, meaning I can't turn the thing on again. However, if I
physically switch it on and off, it reappears, IOW it causes a USB
"insertion" event.

Is there a way to cause an insertion event without physically doing
anything to the dock?

poc
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