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@gbj_tester
Official Mavic dimension for "spoke support diameter" is 606mm, to which most people add 3mm to get ERD as understood by everybody else, so 609mm. Some people have also used values from 607 to 611, there's even a dedicated LFGSS thread!
I'd incline towards 608mm, which will get your spoke ends to the nipple head but not quite to the base of the driver slot (if you have one - I also incline towards hex nipples unless there's a good reason not to use them), which is plenty of thread engagement.