If you start another XBox Live account, you have a one month access to a Gold membership. After that it will turn to Silver, but a month should be plenty to send you tunes, paint, ect. over.
I lost my save but my paints,etc were still there ,and the VIP cars were gifted to me ,if you want to try it just get rid of the career progression or whatever it's called and don't touch anything else. If you want to be safe gift everything to someone with the game on your friends list who you can trust and have them send it all back if you've lost it all.