Here is a patch to allow the creation of multiple symlinks.
The names must be separated by a space character.


REPLACE, KERNEL="ttyUSB0", NAME="visor", SYMLINK="first-%n second-%n third-%n"

results in:

Dec  9 05:28:51 pim udev[12019]: create_node: mknod(udev-root/visor, 020666, 188, 0)
Dec  9 05:28:51 pim udev[12019]: create_node: symlink 'udev-root/first-0' to node 'visor' requested
Dec  9 05:28:51 pim udev[12019]: create_node: symlink(./visor, udev-root/first-0)
Dec  9 05:28:51 pim udev[12019]: create_node: symlink 'udev-root/second-0' to node 'visor' requested
Dec  9 05:28:51 pim udev[12019]: create_node: symlink(./visor, udev-root/second-0)
Dec  9 05:28:51 pim udev[12019]: create_node: symlink 'udev-root/third-0' to node 'visor' requested
Dec  9 05:28:51 pim udev[12019]: create_node: symlink(./visor, udev-root/third-0)