We're in the process of developing an app to tackle the very issue you've described for our clothing brand in France, as we've also started selling in multi-language European countries. Our solution involves Shopify webhooks for new accounts or orders, identifying the customer's locale. This info is then used to add a custom field in Mailchimp for precise segmentation by country or language. Plus, we're integrating DeepL's AI for one-click campaign translations. We're seeking feedback to refine our approach. Would that interest you? What do you all think? Would you be interested in providing feedback and testing our app?