GtrGeorge just copy all your songs and paste them in to ST3 folder and refresh the song list , now throw away your iTunes forever.
If you have two devices, treat one like your master , load it with all your iTunes songs and do all editing on that machine , once you have everything perfect , do a full backup then install that backup on the other device , now you have two identical players , one at home you create new stuff on and the other you take out on gigs, once you have more new material just do another full backup procedure, but keep deleting old full backups or you will soon run out of memory.