If you want a pump you can count on and get good pressure, go with the Zefal HPx Classic.
You will likely need a umbrella or peg clamp to hold on that piece of scaffolding though.
http://www.ebay.com/itm/PUMP-ZEFAL-F...item5d35449a08
The body is still alloy, the thumblock really grabs the valve and the switch in the handle locks out the mounting spring so your not working against it on every stroke. 100psi is no problem for this pump.
Disclaimer, I do not have any of the new Classics but I have a few originals kicking around and they are great pumps. One even managed to fall off a bike, get runned over by the back wheel and still works.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk