My memory is a bit vague on this, tempus fugit, but I do recall that we handed the top pins to the pilots (and at some stage found a suitable place to stow the hard bit of their headwear - the Mk 1 bonedome - while they continued with g-type cloth inner helmet straight out of WWII). The canopy firing mechanism, and pin stowage was, I think, housed behind a perspex cover on the bulkhead above and behind the bang seats.
While we're reminiscing about about Vulcan evacuations - both ground and air - the Spilsby crash was a classic example of thwarted expectations. That is to say, the emergency door opening handle did not perform as the one in the crew escape trainer did; mainly because it had seldom, if ever been used for that function and was as stiff to operate as it should have been. The escape trainer's handle was so slack you hardly had to rock it outboard through the gate. The result was that the Rad held up proceedings long enough for the AEO to be standing on his head (I think there was also a restriction caused by the Rad's umbilical snagging and exacerbating the impatience in the queue behind him).
They eventually got out, but the Rad was never quite the same again. Also, the co-pilot didn't fare too well, as he was biffed on the bonce by the drogue gun slug - saw him in Nocton shortly after while I was in for something trivial. I think it curtailed his flying career too.
The captain had been my first on Vulcans and was praised roundly for avoiding the primary school at Spilsby, which he said was miraculous as the cause of the crash was a bomb bay fire which burned through the control rods (can you believe that, electric powered flying control units actuated by multi-section rods). So big daft B*b was merrily poling around to no effect before he left the sinking ship.
The ground evac that I have in mind took place at Shiraz and left the nose section rather crumpled with the front end pushed upwards and the crew compartment filled with dust and rubble entering via the vis bomb aimer's position. It took a feat of might and brute strength for the AEO to lift the desk that was trapping the rear crew in their seats before they could beat a hasty retreat through the cabrio top. Details a bit vague because I never did listen closeley to the AEO (with whom I crewed for 6 consecutive years), mainly because he mumbled.
The pins in thing was crewroom yak, I don't think anyone seriously contemplated such a ploy. As rear crew you paid your money and tokk your chance; leave it to fate (and training, skill and...)
Mister B