@dbltoe, I'd start by adding those additional option values via the DbIoProductsOptionsValuesHandler.
Once those option-values are in the database (so that you've got products_options_values_id's for them, I'd the DbIoProductsAttributesRawHandler to add those option/option-value pairs to the various products.
Note that neither of the attribute-related handlers currently support a removal. I've created a GitHub issue to remind me of your request.
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