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@Samuli
I was just helping someone get a smaller chainring for their bike and ended up changing the whole crankset, as it seemed to be so difficult to get the one that fit the FSA cranks. All of the direct mounts seem to do pretty much the same thing, but with a slightly different shape hole. I suppose they all want to be the one who invented the standard, they all might have their own patents, they might want to prevent mixing incompatible components but all of these might as well be compatible and you could just ride to the local bike shop and buy a chainring.
https://www.tradeinn.com/f/13717/137172330/fsa-single-comet-direct-mount-chainring.webp
https://www.bike-discount.de/media/image/dc/a7/e6/Shimano_XT-SM-CRM85-Kettenblatt_20072654_a.jpg
https://www.hi5bikes.fi/wp-content/uploads/2020/12/97564.jpeg
https://www.tradeinn.com/f/13692/136924837/race-face-cinch-direct-mount-chainring.jpg
https://www.velonova.lt/image/cache/catalog/products/remote/sram-x-sync-2-eagle-direct-mount-dantratis-3mm-offset-1x11-12-pavaru-0-1200x1200.png
https://www.sram.com/globalassets/image-hierarchy/sram-product-root-images/chainrings/chainrings/cr-x-sync-direct-mount-d1/productassets_cr-xsnc-dm-d1_fg/006218027002_p0_00.png