The latest HLS releases certainly make it pretty easy to do singing faces as it's built right in. That said, I don't know how easy/hard it would be to take that and bring it into LOR.
papagayo is a great program for animated faces. However I have found that if you get all of your mouth movements into the clipboards of LOR it becomes pretty easy to sequence them. It takes some time to get used to it, but it becomes pretty easy after a while.
Hope this helps .. and good luck.