After a small bit of searching I couldn't find any way to export Hummingbird Libray as XML, similar to how MAL does. Since I had a bit of free time on my hands and a desire to hack together some Python I put together an XML exporter. Check it out here:
Anyone interested in the source can find it here:
Licensed under CC BY-SA 4.0, so feel free to mod it to your heart's content.
Let me know what you think, if it breaks, if it already exists, etc.