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http://www.evanscycles.com/products/fast-forward/valve-adaptor-90-degrees-ec028683
i used to use something like this, if that helps.
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I don't think I'll be putting a £400+ air chuck on my £30 track pump
Who's talking about £400? Even the Hirame is under £100 including delivery, the knock-offs and KCNC are more like £30. I've got a Hirame, and it was indeed more expensive than the rest of my SKS Rennkompressor but it changed it from a £50 paperweight into a useful tool as far as disc and H3 inflation duties are concerned.
Just use normal 36-40mm stem valves and your track pump should fit fine, assuming you have a decent air chuck
If you're too cheap to get a genuine Hirame Yoko, I've heard that the cheap knock-off ones also work, as does the KCNC