As it turns out, due to a misunderstanding, the responses from Azure support were answering a slightly different question (about Azure Table Storage instead of Delta Tables on Blob/ADLS Gen2), so we'll try there again. However, still interested in ideas/experiences from this community. 

Also, I couldn't find a way to fix the original post, or delete and recreate without the confusing details that turned out to be about Azure Table Storage so sorry about that.