There are conversion tools... however there still needs to be done a lot of tweaking...
Also on the pa4x high quallity midi files converted give some great results in creating song specific styles, if you play the intro yourself... then there is most of the time atleast 2 variations that can be tweaked into a usefull style...

Sadly all the tweaking takes more time then i currently have, so i domt do it to often..

And just like you look with envy to the huge collection of ready to use Yamaha styles