Hardly short-sighted. Naim stopped making 3 series boards many, many years ago. Demand dropped to a point where it made no sense to continue. Eventually the same thing happened with 5 series boards too. So many were floating around on the second-hand market.
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Definitely true for the UK.
No shortage of the various boards - 3xx and 5xx - used, on eBay and beyond… 
I have bought 323 E boards and 523 S boards, in recent years. I have sold 323 K boards. No problem.
Have you a Naim 4-5 interconnect to return the signal to the NAC 72 too? If so, you are in business.
You and I have created a few E boards between us !
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I just sent a set of 523 S boards to @Darran … He did the magic, with parts from Salisbury.
My 323 E board came like that… 
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