Can't you just reprocess your vertex file to rearrange the vertices in the coordinate system expected by DX9? Most likely it only involves importing and exporting the file through any good 3D design package or you could even write your own script if the format isn't too complicated.

Can't you just reprocess your vertex file to rearrange the vertices in the coordinate system expected by DX9? Most likely it only involves importing and exporting the file through any good 3D design package.