The latter one. If there is only one contact point on the ice blade, I would think it would be feasible. What if someone only practised spins on icehockey blades, I think that the ones movements would be tailored to the iceblade of hockey skates.

I don't think that the method that figure skaters use (skating backwards) would work with icehockey skates, but I would suspect that with a different technique tailored for hockey skates, you can get the same results.