Below is a screen cap of the the options I typically use in similar scenarios. I've always had good luck doing it this way:
There is really no advantage to having the OS and BESR installed on the target drive since you will have to use the System Recovery Disk to restore the partition containing the OS anyway. BESR will not restore over a partition you are already booted to. I don't know what you are using for a drive controller, but I would advise against swapping with drives already preconfigured for a RAID array, and restoring to the already configured partitions. The best way to insure that the drives and RAID controller are in sync with each other is to have the RAID controller build the array and then restore to the newly created array. If you proceed with your original plan, be aware that there could be problems down the road with striping errors or worse.
As for your absentee DR plan, same cautions, but with a different twist. How would you insure that the person inserting the drives is doing so in the correct order? To those of us who do this for a living, it may seem straightforward, but the unskilled person may get truly confused. Try instructing someone how to tie their shoes over the telephone and you will see what I am getting at, This is something we all supposedly know how to do, but trying to instruct someome to do it without visual cues is a lot harder than you would think.