Hello @Saiyajin,
nice write-up.
I used the airgeddon offline cracker that is included with the tool, maybe is a bit faster than john.
I also used a small bash line to do the port knocking, I paste it to give another alternative:
for x in 3456 8234 62431; do nmap -Pn --host_timeout 201 --max-retries 0 -p $x 10.10.10.83; done
Good job 
Regards.