I half-considered getting one of those (I'm in the UK), but the initial cost was expensive and they were single-use as in they needed to go back to the manufacturer to be reset after being triggered which was an additional cost.

https://www.hovding.com/

I'd be dead scared of false positives riding in one. That might be harmless at a speed slightly above pedestrian, but my speed range does not end there.

Could I, as a consumer of said helmet, have performed a non-destructive test ?

I don't believe so - once they were triggered they'd need to be factory reset.

And so my only alternative is to place my utmost and final faith in the product.