You're in a difficult spot. You're RAID0 array was setup as a boot device and you're new SSD is also set up as a boot device. Your applications in your RAID0 array are associated with the OS installation in the RAID0 array and not with the OS installation on your new SSD.
You could do as smorizio has suggested if the amount of space used by the RAID0 array is smaller than the size of the new SSD. Then you could re-create the RAID0 array on the 2 HDDs, reformat and use the space as fast disk.