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@TRA
I could be talking total rubbish, but I have recently been reading about all things chainline. It may not help but...
You could either mount chainring on inside of crank spider, ugly yes but easy to do. Also probably more like -4mm
Or possibly a spacer between the hub wall and cog, only OK if theres enough thread for the lockring.
Or theres always chainring stack bolt spacer thingys.
I'm not sure if any of this is frowned upon or even allows for just minute adjustments but thats my two pence.