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Oh, in case anyone is interested, it was impossible to find Deore M6000 22T rings in europe. 40 & 30 rings are available but seem to be in the process of becoming discontinued. Even SJS cycles in the UK who usually have old and odd stuff are out of them.
I ended up ordering a SLX/Deore FC-M672 ring on eBay which is meant to be compatible.
I think every single one of my non-stock chainrings was made by an after market company. But with the newer four bolt patterns, you might have less choice. I think all of the small granny gear chainrings I have bought were for a five arm (not four) 74mm BCD crank, there were several companies that made them.