Hi Glen
As Max Bygraves said 'I wanna tell you a story'....
Having now filled all 99 folders over the past 5 years with styles for this song and that I have long since realised that what you believe you want in terms of an organised way of doing things at one stage is completely wrong 6 months later.
Yes you can use SD Explorer or similar to move stuff around but it's never long term perfect...as you grow so you change.
The SD Card is so quick that searching for that song specific file you haven't played for months is only a second or two uisng the alphabetic search approach.
So don't worry about shifting it all around just find what you want a different way.
Rog