Seems like at least some of the german stores (bike-components, https://www.bike24.de/p1124069.html) have the M8000 cranks in 165mm, together with the superstar rings @spinnnout posted this should work out nicely.
there are pleny M8000 cranks in 165mm in the UK, my local LBS can get them in no problem. Thanks though.
ah sorry, didn't read properly. Seems like superstar might be your best bet for rings, their round ones only go up to 38 though.
@ExTra started
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Seems like at least some of the german stores (bike-components, https://www.bike24.de/p1124069.html) have the M8000 cranks in 165mm, together with the superstar rings @spinnnout posted this should work out nicely.