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for now i have the 42.... i am just "finishing" the build so i am not sure about the chainring or the cassette, still have to true the wheel and many other things...
i saw somewhere the lekkie rings are used with bafangs
https://lekkie.tech/product-category/chain-rings/
but maybe just any correct bcd ring will do, dont know if lekkie are narrow wide or if that even matters
sorry could not help you much
Thinking of doing the same for my omnium. Did you use the chain ring that came with the bfang motor, or did you find an aftermarket one?