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To provide some closure to this question, I randomly found https://www.ebay.co.uk/itm/Talon-TCR107-42T-94BCD-Black-Chain-Ring/153685666422?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Which are 5 bolt 94bcd and cheap.
https://www.sigmasports.com/item/Wolf-Tooth-Components/94-BCD-5-Bolt-Chainring/IC54
Alternatively I could ball out on this, which is pricey, but probably not much more than buying new cranks. Though I'll only have an 8 speed cassette in the back, so it feels a bit obscene to spend more than I've spent on my derailer, shifter, cassette and cranks combined on a blingy chainring.
I will measure the BB shell to get some more solid data.