I THINK if you change something else to C, then that Ctrl+C will be the same as the hardware Ctrl+C. The only question is: How okay are you with mapping your C to something else, and then where do you put it? (I personally am fine reaching over with my right thumb to the C. I suppose there's different ways to hold it or something. But yeah.)

You MAY also be able to find one of the custom Hildon Desktop packages, or get someone to compile one for you - that lets you change the keyboard combination mappings - I don't know if the one I'm thinking of lets you edit the default ones, but I'm sure it does.