As far as I can tell these rivets are the same in *all* the NP helmets that use the liner rivet system, so there's a lot of them about. It might be a subcontractor, I dunno, all I can say is that some years ago I emailed NP in Coventry and after a bit of to-and-fro a genuinely friendly person sent me a small handul of rivets, so they were obviously there on-site. As you'd expect, really.
They have shown up on Ebay very very occasionally, being sold at truly stunning profiteering prices, hundreds of times original unit cost (I refuse to buy, and so should we all at those prices - don't let these people think they're on to a good thing). Equally occasionally people who are apparently serving soldiers claim they can get them 'easily' but strangely nothing ever transpires from that. I've spent *hours* web-searching for something equivalent and it seems they are a specific design for NP. Every now and then the concept of producing them via 3d-printing comes up, but there are for a start issues with the actual material itself, and then with the deficiencies of the people notionally carrying out the plan (me, for example).
Your analysis of the material and method of production matches mine, and I am *sure* anyone with good scratch-built modelling skills who could make a mould and source an appropriate material could knock these out by the dozen easily. There are doubtless thousands of people fitting that description, but likely none of them have any crossover with helmet-collectors. We've talked about trying it here at home but we'd be coming off from a dead start and we really don't have the time to learn a complete new skill.
As if risen from the grave - Composite Helmet, Ballistic helmets, Military helmets UNITED KINGDOM, UK HELMETS, BRITISH helmet, Kevlar helmet - additions and corrections might stimulate new activity.
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