Constituent Custom Fields / Attributes Mass Update

I've been looking through the Constituent Endpoint Reference to see what control SKY API provides over Constituent custom fields (attributes). Our current process we're looking to automate is syncing interest group opt ins and opt outs between Luminate Online and Raiser's Edge. Luminate Online allows a mass opt in or out with AddRelationships() but I cannot see if it's possible with Raiser's Edge. Currently we use Attributes to see if a constituent is in an Interest group so we don't have many options without taxing our daily quota fairly quick. Is there another option I am missing or is this something I have to add as a suggestion to be added?

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