Thats right mate.
Stick the image of your OS onto a normal HDD, split the SSD RAID and enable Legacy IDE mode in the BIOS, boot into DOS and run HDDErase and perform a secure erase on both SSD's, rebuild the array, run the Acronis boot disk, then re-image your OS from the image on your HDD.
Stick the image of your OS onto a normal HDD, split the SSD RAID and enable Legacy IDE mode in the BIOS, boot into DOS and run HDDErase and perform a secure erase on both SSD's, rebuild the array, run the Acronis boot disk, then re-image your OS from the image on your HDD.