For the greater part of my flying career, I ALWAYS used the acronym
"FUC" Check complete as a final safeguard against exactly this happenning.
F - flaps
U - undercarriage
C - clearance
With these three points covered, not much can go wrong!
I repeated this at each and every final approach, after all else was complete, especially in the sim, and was not caught out, thank God (at least in this area of operations).
Also, I always thought the EGPWS warning went "too low gear" not as quoted in the Australian article.
And yes, 767s do have firewalls, just not in the flight deck.
What happened to the, 1/ uncancellable gear warning with more than flaps 10 selected (at least it's that on the 737) and, 2/ the landing checklist!
Cheers...FD...