I used to play roller-hockey. I was always told that if you could skate in in-line skates you could ice skate. The balance and weight distribution is the same.
you can take the blade out and make it a shoe then you some wheels nail them on and walla you got roller blades or you can buy covers for your skates with wheels and that would work but the easiest...
They are both good for health and pretty easy after lots of practice. The only difference is that in ice-skating you can only skate in ice rinks, while roller-skates have specially designed indoor...