A new metric is now available from the Bing connector. The All Conversions metric is available for all reports with regular metrics (i.e not the non-aggregatable metric report type).
This metric will represent data for all conversion goals regardless of their ExcludeFromBidding setting.
To get historical data for an already connected Bing data source you need to reach out to email@example.com and we'll help out. To find out more about our Bing connector, check out the What data can i get from Bing? article.