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Treat “portable breast pump” as a category/collection keyword. That page can rank for the broad term and electric variations. That page can do the heavy SEO lifting. Double check what pages come up in SERPs – category pages or product pages?
Don’t overthink unique primary keywords for very similar products. Some products don’t need their own keyword target, If there’s no real search demand. In those cases, optimize for brand/model accuracy and user experience.
