I honestly don't know if it was always available. When the DLC first came out I still had my save from completing the base game so I just played off of that. But when I bought the Complete edition on a sale on Xbox Live just to see how it ran on the Xbox One X the option was definitely there. I just jumped right into the Blood and Wine content.
Maybe it's something that was added in the complete/GOTY edition then.
Either way, yeah that sort of thing would definitely solve the problem I had back when the DLC originally came out.