I was thinking of a system where after importing from the armory you are asked what each WoW rank should translate to on your site. IE:
Imported Rank 1 is automatically promoted to site rank Guild Master. Rank 2 is Officer. Rank 3, 4, 5 are all promoted to Member, etc.

Maybe have it ask each time you import or have a new section that you can set the defaults in prior to importing.

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Wolfify
Resto Druid
<Infamous With Style>
Darkspear -- Alliance

This is something I've given some thought to because it absolutely makes sense to have rank bindings of this nature. I just haven't done it yet

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It's all in the reflexes.