It does actually say in the HCL that the only drive is for CE 4.2... so I'm not sure why you're surprised, lol.
The HCL listing states to use a reference driver, which if H0020 doe not work, you can use
http://www.hpcfactor.com/support/cesd/h/0028.asp which are the Prism reference drivers.
Thanks for posting your guide though
Good stuff.