Yeah, blacklisting means the driver will not be loaded automatically and so
is disabled.
I guess in order to change the live CD you would need to change the .ISO the
CD is made from and then burn another CD or reburn your rewritable CD. I
don't know how to change the .ISO. With a live USB on the other hand it would
be easy to change the file on the USB without having to change the ISO.
Since you say radeon was blacklisted on 6.0 too I'm not sure all this will
help though. Still probably worth trying.