Yup, unfortunately it looks like this. I know you don't want to mess up with the booting and stuff, but my suggestions is that you use the SSD as a main (OS) drive and keep the HDDs in RAID 0. Unfortunately you'll probably still have to backup your data somewhere and redo the RAID so that you can get the OS out of it. And when installing the new Windows on the SSD, please remember to have all other drives disconnected.