I can vouch for the Kahtoola KTS crampons for using with flexible footwear. I've worn them on very light boots with no problems. The Microspikes are also good, as mentioned above, but maybe not as useful on steeper ground.
I wouldn't carry a groundsheet for wild camping -- rather defeats the object of getting a superlite tent, and if pitched with care there shouldn't be any problems. If car camping the odd night I might use a a piece of polythene cut to size.
The Grivel Monet Rosa crampons are basically G10s but without the flashy finish, and cost less. The 10pt crampons sold by Go Outdoors are made by Grivel, and can often be bought cheaper than rrp in one of Go's frequent sales. Or the Climbing Technology Nevis 10pt is a good crampon at a very reasonable price. A friend of mine has been using a pair for a couple of year's and reckons they're spot on.