Some one said the VS liner rollers are $35 a pop - OUCH!
You are right Eben - if ya want to put the time into it you can retrofit almost anything.

You can machine a spacer to fill the gap since the arbors are different size, but you have to cut away that ss tooth/tapered post on the 706Z - it would interfer w/ the VS line roller.
The diameters of each liner roller are a little different as well so that will influence how the line lays one the spool. VS is 9.0mm and the 706z is 9.5mm. You may have to shim the VS liner roller out as well to clear the aluminum cast L bracket on the 706z - if u do that you can run out of stud/post length.
Installing VS's frame that holds the roller to the rotor cup is probably another $35+ part so learning how to deal w/the line popping out may be cheaper in the long run. I always keep my pointing finger out and keep tension on the line regardless of lure/bait weight. Just a habit I developed over the yrs from fishing light lures on 2-4 lb mono.
Why does the VS liner roller have such a long "flat" on it where the line lays?? Every other company makes it a notch for the line to fit. I think the reason VS has line lay issues w/ braid on certain size reels is because they use the SAME line roller on the 100 up to 300. Not sure of the 400 size since I have never seen one in person.
If you really want to do it, PN - buy the parts and send me the reel. I'll mess around with it for ya during the winter when I'm bored of hopping around on the internet.
I totally agree w/ Eben's about how often & hard you fish in the surf. I was out in Westerly on Sunday and the surf was BIG. I got smashed by the water a number of times and was happy my Shimano Spheros had a water proof drag.

A buddy of mine was laughing at me when I was spitting saltwater out of my mouth and shaking my reel to get the water out of it.....LOL. I hate tearing reels apart and cleaning them out - that is a winter project.