BWG and its Codex do not provide guidance for wholly remaking human lifepaths for settings for which they are innapropriate. The text cautions about trying to do so and advises reskinning lifepaths or making only small incremental changes to the lifepaths.
What the advice does not include and what the suggestion does not itself let you get to is a setting whose lifepath settings are structurally rearranged. For example the born peasant/village/city/noble/sea split and the leads from them imply a certain kind of world - thats part of what makes the books so cool! However those arrangements don’t suit a hunter-gatherer society or nomad hordes or a caste system society.
Does anyone have advice on good-practices for how to rearrange lifepaths and leads (imagine for the purpose of this question that i was actually going to leave every individual life path unchanged other than its leads and setting)?
What careful balancing/analysis was done during game development to achieve the current arrangements of lifepaths?