You can get crimp-on hose clamps that are more-or-less permanent and do not have sharp edges. I think those would be the ultimate solution if you can find them.
Another idea might be to get some really big heat shrink tubing and cover the regular hose clamps.
Or...you could go down to your local marine store and buy some of that waterproof stretchy electrical tape stuff and use that to cover the clamps.
Also, if you can't find the crimp-on ones and you are using those sharp flimsy ones with holes in the bands, you could at least switch to some good hose clamps like these:
http://www.ultimategarage.com/abaprice.html You might try a BMW dealer since I know they use this type of clamp (except with a little BMW stamp on it) when they don't use a crimp-on type.