Found some information on the file format http://mk8.tockdom.com/wiki/BFSTM_(File_Format) ,
as well as a tool by @AboodXD https://github.com/aboood40091/BCFSTM-BCFWAV-Converter but when going from Wii U .bfstm to Switch it only changes the header file so for a fix I have Found is using 010...