You can modify Texture Paths of WMOs with Taliis (or even create a new one if I remember correctly, however there is no way of putting that information of all the vertices you're having into it)
As schlumpf already pointed out Tigu once wrote a tool for it but it was too bugged to work stable and it also didn't feature UV Maps, so unless you want a blank colored wmo it's not the tool you're looking for.
A few days ago I had a little chat with Tigu about it and he said there haven't been any improvements done to it.