I tested this on 3 N2 Systems. I found that this part alone solves my reboot issues:
Create a directory /etc/initramfs-tools/scripts/local-block
Create an executable script in that directory with these contents:
delay=20
echo Sleeping for ${delay} seconds to allow disk to be found...
sleep ${delay}
"update-initramfs -u" to incorporate the new script into the ramdisk.
Of course I still have the SD Cards within these systems, but that a very minor issue to me.
Thanks @lavorrick for providing that guidance.
