If Hubspot doesn’t natively support IndexNow, your workaround with the uploaded file and redirect is a solid start. To automate submissions to Bing without Hubspot-native functionality, consider setting up an external server or script to monitor content changes via Hubspot’s Content API and submit the updated URLs using the IndexNow API. Alternatively, you can push Hubspot to integrate IndexNow by advocating for support through their feedback channels. External automation tools or manual submissions may be the best interim solution.