Sorry, I was wrong. Use mount instead of ln -s. Create a folder for each mount, too.
Bash
#!/bin/sh
(
mkdir /var/media/<YOUR_PREFERRED_PATITION_NAME>
mount /dev/disk/by-uuid/<YOUR_PARTITION_ID> /var/media/<YOUR_PREFERRED_PATITION_NAME>
) &
To my knowledge, LE will always add external disk partitions to /var/media, so you eventually get them twice.