Well Vista comes with almost eery SATA Driver out there. Plus several RAID configurations. So how Vista doesnt recognize your HDD is beyond me.
but they are said to be incompatible with my hardware
If they are incompatible how do you expect them to work even if you can get them on there? If they are incompatible that means they wont work with that hardware. So even getting them on there wont do you any good. At which point this whole process become futile. Since no matter what it wont work since they are incompatible.
vLite - Windows Vista configuration tool
If you are lucky that can slipstream the drivers into the Vista DVD ISO and allow you to install on the drives. If not then you will have to try and use a flash drive.