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Interesting! Thanks for sharing.
I have a response from BETD too. It's polite and informative, but doesn't specifically answer the question of replacing the axle on the RO2 cranks I have. Instead they recommend (three times! for three different reasons!) I use RS8s.
I'm officially abandoning my attempt to create White Industries A30 alternative using things I have in the cellar. I hope you have better luck!
Useful Middleburn RS8 spindle removal info from an Insta-acquaintance with great taste in bikes.