Yes, easiest solution would be to have the output shafts replaced with the Porsche 930 flange. There's a wide range of strong CV's available that use the 930 bolt pattern and this makes things easier, both for custom CV's and off-the-shelf.
As has already been said, adapters aren't ideal as they shorten the CV which in turn increases the angles throughout the range of motion.
As has already been said, adapters aren't ideal as they shorten the CV which in turn increases the angles throughout the range of motion.