Alphabetical author list in non-alphabetical journal (A followup for this question)

Say your field's convention is to have alphabetical-ordered author list. What should you do when your work is accepted to a (multidisciplinary) journal in which the convention is to order the author by contribution (e.g. Nature)?
If it's a well-known journal like Nature, then I would follow their convention. Everybody who reads the article will assume that you do.