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Thirdly I have emailed GM Head Office to establish and chase down the company who built the original VC Commodore steering racks. When this is forthcoming I will request that Company to supply me with details of the load, twist and torsion tests performed on the original VC racks, how the tests were performed and what were the results.
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Baz i would try and get some answers from the inspector about specifically what testing they need. You might find they are interested in the durability of the modification rather than the initial performance (eg fatigue, corrosion resistance etc).
It might be worth just locating a mob that shorten steering racks (who have ADR approval) and getting a price from them to shorten another one. VC commodore racks arnt going to be overly expensive and depending on the method of shortening, it probably wont be that expensive. I know there are a few VC's at pick and payless at the moment.
Paying for specialized testing to be carried may be exy and it may require destructive testing. Also to have another shortened could probably be organised and completed in just a few days. For the sake of $500 or so its probably worth saving the hassle of chasing a manufacturer from the early 80's.