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As far as I know, the only other option for grips are Karl Nills grips. They make some very nice "combat" type grips, as well as the PSG-1 style grip (which you can get for the Swiss arms rifles as well).
Although there may be some companies that make a rubberized grip for the Swiss arms type rifles, I've never seen them before - of course I don't have a Swiss rifle so I've never looked
ETA
For example, this one (wood stained black) is the "tactical" kinda series (they're called custom series) and has a very ergonomic shape to it, but they are very expensive, in the 200 dollar range before tax/shipping/import duties.
They will export to Canada with some very basic paperwork to fill out.