[cooperino]

I would suggest you have a look at the manual found here in technical section.
Short answer to your question "can you remove Flex Disc" no.
It would be nearly impossible to achieve perfect alignment from engine to rear. Even if you could you would still want the joint as a buffer for torque related shock.

There may be other types of joints guys are running out there but none are cheaper or easier to getvthab the original type.