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@gbj_tester
Obviously, in theory you can change the freehub body, but...
Do you know which year they are from? I can't find a tech manual for Cosmic Pro (I'm assuming you mean the old aluminium wheels), which either means Mavic are being slack or the wheel predates the internet. If it's from before 2000 or so, it definitely has the old style freehub, and you're going to struggle to find a spare Hyperglide body for them even though such a thing did exist at the time. If they are significantly later than that, they almost certainly use the FTS-L freehub body, which is Mavic's current and more or less universal design (some very low end Mavic wheels are different, but that doesn't apply here)
For the Cosmic Carbon variants, apparently you can tell the old FTS freehubs from the later FTS-L ones by the axle lock nut on the drive side - if it's a hexagon, it should be FTS-L. If you're in luck with the basic design, FTS-L bodies are £29.99 from
http://www.chainreactioncycles.com/Models.aspx?ModelID=33442
On an old wheelset like this, that could be a deal breaker - you might be better off waiting for a Shimano set to come up, since they are more common and won't carry the premium usually attached to Campag compatible wheels.