I'm not sure if it's still offered, but the Treadwright tires had an option for some kind of abrasive that could be added to the treads to likely make it better in packed snow and ice. I didn't get those since I was using them year round at the time.
I don't know if anything other than studs or chains will work great on ice and unless you live where the snow lingers on the roads consistently during the winter there may be local or state restrictions about how long studs and chains can be used. I get the more sipes thought, but have always had good luck with the large tread blocks self clearing of snow easily and allowing grip in slush that clogs the treads of an AT tire. I have brand new ATs on the LX450 right now, but will swap on the re-treads as soon as serious snow is forecast.
I don't know if anything other than studs or chains will work great on ice and unless you live where the snow lingers on the roads consistently during the winter there may be local or state restrictions about how long studs and chains can be used. I get the more sipes thought, but have always had good luck with the large tread blocks self clearing of snow easily and allowing grip in slush that clogs the treads of an AT tire. I have brand new ATs on the LX450 right now, but will swap on the re-treads as soon as serious snow is forecast.